Initial commit for Query Store extension (#23260)

* Initial commit for Query Store extension

* fix eslint explicit-functino-return-type setting

* address comments

* remove specifying explicit-function-return-type eslint rule

* update strings

extensions/query-store/src/extension.ts

@@ -0,0 +1,13 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import * as vscode from 'vscode';
+
+export async function activate(_context: vscode.ExtensionContext): Promise<void> {
+}
+
+export function deactivate(): void {
+
+}

extensions/query-store/src/typings/ref.d.ts

@@ -0,0 +1,10 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+/// <reference path='../../../../src/vscode-dts/vscode.d.ts'/>
+/// <reference path='../../../../src/sql/azdata.d.ts'/>
+/// <reference path='../../../../src/sql/azdata.proposed.d.ts'/>
+/// <reference path='../../../mssql/src/mssql.d.ts'/>
+/// <reference types='@types/node'/>