Adding Execution Plan Editor to ADS (#18696)

* Pushing Execution Plan Editor

* Renaming class
Handling error

* Awaiting for handlers to be registered

* Addressing some PR comments

* Fixing return type for provider

* Fixing editor id and removing unnecessary overrides

* Adding a namespace

* adding execution plan namespace

* Adding protocol comment

* Fixing if logic

* Fixing error message

* Cleaning up code

* cleanup code

* Adding help comments

* Fixing method call

* Using path.ts to get the base file name

* converting to lambda functions

* Adding comment for run action

* Fixing pr comments

* Fixing editor label

* Fixing doc comments

* Adding some more comments

* Fixign branding in comments

src/sql/workbench/api/common/sqlExtHost.api.impl.ts

@@ -385,6 +385,10 @@ export function createAdsApiFactory(accessor: ServicesAccessor): IAdsExtensionAp
 				return extHostDataProvider.$registerTableDesignerProvider(provider);
 			};
 
+			let registerExecutionPlanProvider = (provider: azdata.executionPlan.ExecutionPlanProvider): vscode.Disposable => {
+				return extHostDataProvider.$registerExecutionPlanProvider(provider);
+			};
+
 			// namespace: dataprotocol
 			const dataprotocol: typeof azdata.dataprotocol = {
 				registerBackupProvider,
@@ -406,6 +410,7 @@ export function createAdsApiFactory(accessor: ServicesAccessor): IAdsExtensionAp
 				registerSqlAssessmentServicesProvider,
 				registerDataGridProvider,
 				registerTableDesignerProvider,
+				registerExecutionPlanProvider: registerExecutionPlanProvider,
 				onDidChangeLanguageFlavor(listener: (e: azdata.DidChangeLanguageFlavorParams) => any, thisArgs?: any, disposables?: extHostTypes.Disposable[]) {
 					return extHostDataProvider.onDidChangeLanguageFlavor(listener, thisArgs, disposables);
 				},