Add query execution plan extensibility APIs (#4072)

* WIP 1

* WIP 2

* Fix typos

* Iterate on API a bit

* Query Tab WIP

* More dynamic query tab impl

* Fix merge breaks

* Update interfaces

* Update to single event handler for query events

* Remove query plan extension

* Add generated JS file

src/sql/platform/query/common/queryModel.ts

@@ -16,7 +16,8 @@ import {
 	EditSubsetResult,
 	EditCreateRowResult,
 	EditRevertCellResult,
-	ExecutionPlanOptions
+	ExecutionPlanOptions,
+	queryeditor
 } from 'azdata';
 import { QueryInfo } from 'sql/platform/query/common/queryModelService';
 
@@ -24,6 +25,18 @@ export const SERVICE_ID = 'queryModelService';
 
 export const IQueryModelService = createDecorator<IQueryModelService>(SERVICE_ID);
 
+export interface IQueryPlanInfo {
+	providerId: string;
+	fileUri: string;
+	planXml: string;
+}
+
+export interface IQueryEvent {
+	type: queryeditor.QueryEvent;
+	uri: string;
+	params?: any;
+}
+
 /**
  * Interface for the logic of handling running queries and grid interactions for all URIs.
  */
@@ -56,7 +69,7 @@ export interface IQueryModelService {
 
 	onRunQueryStart: Event<string>;
 	onRunQueryComplete: Event<string>;
-
+	onQueryEvent: Event<IQueryEvent>;
 
 	// Edit Data Functions
 	initializeEdit(ownerUri: string, schemaName: string, objectName: string, objectType: string, rowLimit: number, queryString: string): void;