Adding group by schema to OE (#21941)

* Adding group by schema and updating schema icon

* Adding item context menu

* Fixing command logic

* Adding telemetry for group by and changing default config

* reverting no child nodes error message

* Code cleanup

* Cleaning up constants

* Removing unused imports

* Update extensions/mssql/src/main.ts

Co-authored-by: Charles Gagnon <chgagnon@microsoft.com>

* converting to sendActionEvent

* sendActionEvent

* Adding telemetryViews and telemetry actions

* Fixing localized string

* registering context

---------

Co-authored-by: Charles Gagnon <chgagnon@microsoft.com>

extensions/mssql/src/telemetry.ts

@@ -76,3 +76,12 @@ export class LanguageClientErrorHandler implements ErrorHandler {
 		return CloseAction.DoNotRestart;
 	}
 }
+
+export enum TelemetryViews {
+	MssqlObjectExplorer = 'mssqlObjectExplorer'
+}
+
+export enum TelemetryActions {
+	GroupBySchemaEnabled = 'objectExplorerGroupBySchemaEnabled',
+	GroupBySchemaDisabled = 'objectExplorerGroupBySchemaDisabled',
+}