Boilerplate for SQL Bindings Extension (#18624)

* boilerplate for sql bindings extension

* edit gulpfile task as it was trying to find specific menus within package.json

extensions/sql-bindings/src/extension.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.
+ *--------------------------------------------------------------------------------------------*/
+
+export function activate(): void {
+}
+
+export function deactivate(): void {
+}