edit/commit Command (#262)

The main goal of this feature is to enable a command that will
1) Generate a parameterized command for each edit that is in the session
2) Execute that command against the server
3) Update the cached results of the table/view that's being edited with the committed changes (including computed/identity columns)

There's some secret sauce in here where I cheated around worrying about gaps in the updated results. This was accomplished by implementing an IComparable for row edit objects that ensures deletes are the *last* actions to occur and that they occur from the bottom of the list up (highest row ID to lowest). Thus, all other actions that are dependent on the row ID are performed first, then the largest row ID is deleted, then next largest, etc. Nevertheless, by the end of a commit the associated ResultSet is still the source of truth. It is expected that the results grid will need updating once changes are committed.

Also worth noting, although this pull request supports a "many edits, one commit" approach, it will work just fine for a "one edit, one commit" approach.

* WIP

* Adding basic commit support. Deletions work!

* Nailing down the commit logic, insert commits work!

* Updates work!

* Fixing bug in DbColumnWrapper IsReadOnly setting

* Comments

* ResultSet unit tests, fixing issue with seeking in mock writers

* Unit tests for RowCreate commands

* Unit tests for RowDelete

* RowUpdate unit tests

* Session and edit base tests

* Fixing broken unit tests

* Moving constants to constants file

* Addressing code review feedback

* Fixes from merge issues, string consts

* Removing ad-hoc code

* fixing as per @abist requests

* Fixing a couple more issues

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

@@ -37,7 +37,6 @@ ConnectionServiceConnStringInvalidIntent(string intent) = Invalid value '{0}' fo
 
 ConnectionServiceConnectionCanceled = Connection canceled
 
-######
 ### Connection Params Validation Errors
 
 ConnectionParamsValidateNullOwnerUri = OwnerUri cannot be null or empty
@@ -110,7 +109,7 @@ QueryServiceQueryInProgress = A query is already in progress for this editor ses
 
 QueryServiceMessageSenderNotSql = Sender for OnInfoMessage event must be a SqlConnection
 
-QueryServiceResultSetReaderNull = Reader cannot be null
+QueryServiceResultSetAddNoRows = Cannot add row to result buffer, data reader does not contain rows
 
 ### Save As Requests
 
@@ -199,6 +198,8 @@ EditDataColumnNoKeyColumns = No key columns were found
 
 EditDataScriptFilePathNull = An output filename must be provided
 
+EditDataCommitInProgress = A commit task is in progress. Please wait for completion.
+
 ############################################################################
 # DacFx Resources
 
@@ -264,3 +265,8 @@ BatchParser_VariableNotDefined = Variable {0} is not defined.
 # Workspace Service
 
 TestLocalizationConstant = EN_LOCALIZATION
+
+############################################################################
+# Utilities
+
+SqlScriptFormatterDecimalMissingPrecision = Decimal column is missing numeric precision or numeric scale