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.Hosting/Localization/sr.resx

@@ -120,61 +120,61 @@
   <data name="CredentialsServiceInvalidCriticalHandle" xml:space="preserve">
     <value>Invalid CriticalHandle!</value>
     <comment></comment>
-  </data>
+  </data>
   <data name="CredentialsServicePasswordLengthExceeded" xml:space="preserve">
     <value>The password has exceeded 512 bytes</value>
     <comment></comment>
-  </data>
+  </data>
   <data name="CredentialsServiceTargetForDelete" xml:space="preserve">
     <value>Target must be specified to delete a credential</value>
     <comment></comment>
-  </data>
+  </data>
   <data name="CredentialsServiceTargetForLookup" xml:space="preserve">
     <value>Target must be specified to check existance of a credential</value>
     <comment></comment>
-  </data>
+  </data>
   <data name="CredentialServiceWin32CredentialDisposed" xml:space="preserve">
     <value>Win32Credential object is already disposed</value>
     <comment></comment>
-  </data>
+  </data>
   <data name="ServiceAlreadyRegistered" xml:space="preserve">
     <value>Cannot register service for type {0}, one or more services already registered</value>
     <comment></comment>
-  </data>
+  </data>
   <data name="MultipleServicesFound" xml:space="preserve">
     <value>Multiple services found for type {0}, expected only 1</value>
     <comment></comment>
-  </data>
+  </data>
   <data name="IncompatibleServiceForExtensionLoader" xml:space="preserve">
     <value>Service of type {0} cannot be created by ExtensionLoader&lt;{1}&gt;</value>
     <comment></comment>
-  </data>
+  </data>
   <data name="ServiceProviderNotSet" xml:space="preserve">
     <value>SetServiceProvider() was not called to establish the required service provider</value>
     <comment></comment>
-  </data>
+  </data>
   <data name="ServiceNotFound" xml:space="preserve">
     <value>Service {0} was not found in the service provider</value>
     <comment></comment>
-  </data>
+  </data>
   <data name="ServiceNotOfExpectedType" xml:space="preserve">
     <value>Service of Type {0} is not compatible with registered Type {1}</value>
     <comment></comment>
-  </data>
+  </data>
   <data name="HostingUnexpectedEndOfStream" xml:space="preserve">
     <value>MessageReader's input stream ended unexpectedly, terminating</value>
     <comment></comment>
-  </data>
+  </data>
   <data name="HostingHeaderMissingColon" xml:space="preserve">
     <value>Message header must separate key and value using ':'</value>
     <comment></comment>
-  </data>
+  </data>
   <data name="HostingHeaderMissingContentLengthHeader" xml:space="preserve">
     <value>Fatal error: Content-Length header must be provided</value>
     <comment></comment>
-  </data>
+  </data>
   <data name="HostingHeaderMissingContentLengthValue" xml:space="preserve">
     <value>Fatal error: Content-Length value is not an integer</value>
     <comment></comment>
-  </data>
-</root>
+  </data>
+</root>