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/services/executionPlan/common/interfaces.ts

@@ -0,0 +1,30 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import type * as azdata from 'azdata';
+import { createDecorator } from 'vs/platform/instantiation/common/instantiation';
+
+
+export const SERVICE_ID = 'executionPlanService';
+
+export const IExecutionPlanService = createDecorator<IExecutionPlanService>(SERVICE_ID);
+
+export interface IExecutionPlanService {
+	_serviceBrand: undefined;
+
+	/**
+	 * Registers an execution plan service provider.
+	 */
+	registerProvider(providerId: string, provider: azdata.executionPlan.ExecutionPlanProvider): void;
+	/**
+	 * Gets an execution plan for the given planFile.
+	 */
+	getExecutionPlan(planFile: azdata.executionPlan.ExecutionPlanGraphInfo): Promise<azdata.executionPlan.GetExecutionPlanResult>;
+
+	/**
+	 * Get execution plan file extensions supported by the provider.
+	 */
+	getSupportedExecutionPlanExtensionsForProvider(providerId: string): string[];
+}