Edit Data Service (#241)

This is a very large change. I'll try to outline what's going on.

1. This adds the **EditDataService** which manages editing **Sessions**.
    1. Each session has a **ResultSet** (from the QueryExecutionService) which has the rows of the table and basic metadata about the columns 
    2. Each session also has an **IEditTableMetadata** implementation which is derived from SMO metadata which provides more in-depth and trustworthy data about the table than SqlClient alone can.
    3. Each session holds a list of **RowEditBase** abstract class implementations
        1. **RowUpdate** - Update cells in a row (generates `UPDATE` statement)
        2. **RowDelete** - Delete an entire row (generates `DELETE` statement)
        3. **RowCreate** - Add a new row (generates `INSERT INTO` statement)
    4. Row edits have a collection of **CellUpdates** that hold updates for individual cells (except for RowDelete)
        1. Cell updates are generated from text
     5. RowEditBase offers some baseline functionality
        1. Generation of `WHERE` clauses (which can be parameterized)
        2. Validation of whether a column can be updated
2. New API Actions
    1. edit/initialize - Queries for the contents of a table/view, builds SMO metadata, sets up a session
    2. edit/createRow - Adds a new RowCreate to the Session
    3. edit/deleteRow - Adds a new RowDelete to the Session
    4. edit/updateCell - Adds a CellUpdate to a RowCreate or RowUpdate in the Session
    5. edit/revertRow - Removes a RowCreate, RowDelete, or RowUpdate from the Session
    6. edit/script - Generates a script for the changes in the Session and stores to disk
    7. edit/dispose - Removes a Session and releases the query
3. Smaller updates (unit test mock improvements, tweaks to query execution service)

**There are more updates planned -- this is just to get eyeballs on the main body of code**

* Initial stubs for edit data service

* Stubbing out update management code

* Adding rudimentary dispose request

* More stubbing out of update row code

* Adding complete edit command contracts, stubbing out request handlers

* Adding basic implementation of get script

* More in progress work to implement base of row edits

* More in progress work to implement base of row edits

* Adding string => object conversion logic and various cleanup

* Adding a formatter for using values in scripts

* Splitting IMessageSender into IEventSender and IRequestSender

* Adding inter-service method for executing queries

* Adding inter-service method for disposing of a query

* Changing edit contract to include the object to edit

* Fully fleshing out edit session initialization

* Generation of delete scripts is working

* Adding scripter for update statements

* Adding scripting functionality for INSERT statements

* Insert, Update, and Delete all working with SMO metadata

* Polishing for SqlScriptFormatter

* Unit tests and reworked byte[] conversion

* Replacing the awful and inflexible Dictionary<string, string>[][] with a much better test data set class

* Fixing syntax error in generated UPDATE statements

* Adding unit tests for RowCreate

* Adding tests for the row edit base class

* Adding row delete tests

* Adding RowUpdate tests, validation for number of key columns

* Adding tests for the unit class

* Adding get script tests for the session

* Service integration tests, except initialization tests

* Service integration tests, except initialization tests

* Adding messages to sr.strings

* Adding messages to sr.strings

* Fixing broken unit tests

* Adding factory pattern for SMO metadata provider

* Copyright and other comments

* Addressing first round of comments

* Refactoring EditDataService to have a single method for handling
session-dependent operations
* Refactoring Edit Data contracts to inherit from a Session and Row
operation params base class
* Copyright additions
* Small tweak to strings
* Updated unit tests to test the refactors

* More revisions as per pull request comments

src/Microsoft.SqlTools.ServiceLayer/Localization/sr.cs

@@ -485,6 +485,134 @@ namespace Microsoft.SqlTools.ServiceLayer
             }
         }
 
+        public static string EditDataSessionNotFound
+        {
+            get
+            {
+                return Keys.GetString(Keys.EditDataSessionNotFound);
+            }
+        }
+
+        public static string EditDataQueryNotCompleted
+        {
+            get
+            {
+                return Keys.GetString(Keys.EditDataQueryNotCompleted);
+            }
+        }
+
+        public static string EditDataQueryImproperResultSets
+        {
+            get
+            {
+                return Keys.GetString(Keys.EditDataQueryImproperResultSets);
+            }
+        }
+
+        public static string EditDataFailedAddRow
+        {
+            get
+            {
+                return Keys.GetString(Keys.EditDataFailedAddRow);
+            }
+        }
+
+        public static string EditDataRowOutOfRange
+        {
+            get
+            {
+                return Keys.GetString(Keys.EditDataRowOutOfRange);
+            }
+        }
+
+        public static string EditDataUpdatePending
+        {
+            get
+            {
+                return Keys.GetString(Keys.EditDataUpdatePending);
+            }
+        }
+
+        public static string EditDataUpdateNotPending
+        {
+            get
+            {
+                return Keys.GetString(Keys.EditDataUpdateNotPending);
+            }
+        }
+
+        public static string EditDataObjectMetadataNotFound
+        {
+            get
+            {
+                return Keys.GetString(Keys.EditDataObjectMetadataNotFound);
+            }
+        }
+
+        public static string EditDataInvalidFormatBinary
+        {
+            get
+            {
+                return Keys.GetString(Keys.EditDataInvalidFormatBinary);
+            }
+        }
+
+        public static string EditDataInvalidFormatBoolean
+        {
+            get
+            {
+                return Keys.GetString(Keys.EditDataInvalidFormatBoolean);
+            }
+        }
+
+        public static string EditDataCreateScriptMissingValue
+        {
+            get
+            {
+                return Keys.GetString(Keys.EditDataCreateScriptMissingValue);
+            }
+        }
+
+        public static string EditDataDeleteSetCell
+        {
+            get
+            {
+                return Keys.GetString(Keys.EditDataDeleteSetCell);
+            }
+        }
+
+        public static string EditDataColumnIdOutOfRange
+        {
+            get
+            {
+                return Keys.GetString(Keys.EditDataColumnIdOutOfRange);
+            }
+        }
+
+        public static string EditDataColumnCannotBeEdited
+        {
+            get
+            {
+                return Keys.GetString(Keys.EditDataColumnCannotBeEdited);
+            }
+        }
+
+        public static string EditDataColumnNoKeyColumns
+        {
+            get
+            {
+                return Keys.GetString(Keys.EditDataColumnNoKeyColumns);
+            }
+        }
+
+        public static string EditDataScriptFilePathNull
+        {
+            get
+            {
+                return Keys.GetString(Keys.EditDataScriptFilePathNull);
+            }
+        }
+
         public static string EE_BatchSqlMessageNoProcedureInfo
         {
             get
@@ -790,6 +918,11 @@ namespace Microsoft.SqlTools.ServiceLayer
             return Keys.GetString(Keys.WorkspaceServiceBufferPositionOutOfOrder, sLine, sCol, eLine, eCol);
         }
 
+        public static string EditDataUnsupportedObjectType(string typeName)
+        {
+            return Keys.GetString(Keys.EditDataUnsupportedObjectType, typeName);
+        }
+
         [System.Runtime.CompilerServices.CompilerGeneratedAttribute()]
         public class Keys
         {
@@ -1008,6 +1141,57 @@ namespace Microsoft.SqlTools.ServiceLayer
             public const string WorkspaceServiceBufferPositionOutOfOrder = "WorkspaceServiceBufferPositionOutOfOrder";
 
 
+            public const string EditDataSessionNotFound = "EditDataSessionNotFound";
+
+
+            public const string EditDataUnsupportedObjectType = "EditDataUnsupportedObjectType";
+
+
+            public const string EditDataQueryNotCompleted = "EditDataQueryNotCompleted";
+
+
+            public const string EditDataQueryImproperResultSets = "EditDataQueryImproperResultSets";
+
+
+            public const string EditDataFailedAddRow = "EditDataFailedAddRow";
+
+
+            public const string EditDataRowOutOfRange = "EditDataRowOutOfRange";
+
+
+            public const string EditDataUpdatePending = "EditDataUpdatePending";
+
+
+            public const string EditDataUpdateNotPending = "EditDataUpdateNotPending";
+
+
+            public const string EditDataObjectMetadataNotFound = "EditDataObjectMetadataNotFound";
+
+
+            public const string EditDataInvalidFormatBinary = "EditDataInvalidFormatBinary";
+
+
+            public const string EditDataInvalidFormatBoolean = "EditDataInvalidFormatBoolean";
+
+
+            public const string EditDataCreateScriptMissingValue = "EditDataCreateScriptMissingValue";
+
+
+            public const string EditDataDeleteSetCell = "EditDataDeleteSetCell";
+
+
+            public const string EditDataColumnIdOutOfRange = "EditDataColumnIdOutOfRange";
+
+
+            public const string EditDataColumnCannotBeEdited = "EditDataColumnCannotBeEdited";
+
+
+            public const string EditDataColumnNoKeyColumns = "EditDataColumnNoKeyColumns";
+
+
+            public const string EditDataScriptFilePathNull = "EditDataScriptFilePathNull";
+
+
             public const string EE_BatchSqlMessageNoProcedureInfo = "EE_BatchSqlMessageNoProcedureInfo";