Initial commit of Database Projects extension (#8540)

* Initial commit of Database Projects extension

* Removing unused references, correcting license, tabs -> spaces in package.json

* cleaning up linter errors

extensions/sql-database-projects/src/main.ts

@@ -0,0 +1,24 @@
+/*---------------------------------------------------------------------------------------------
+ *  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';
+import MainController from './controllers/mainController';
+
+let controllers: MainController[] = [];
+
+export async function activate(context: vscode.ExtensionContext): Promise<void> {
+	// Start the main controller
+	let mainController = new MainController(context);
+	controllers.push(mainController);
+	context.subscriptions.push(mainController);
+
+	await mainController.activate();
+}
+
+export function deactivate(): void {
+	for (let controller of controllers) {
+		controller.deactivate();
+	}
+}