chore(lint): Added license headers to most TypeScript files

Relates to #9380

modules/@angular/core/private_export.ts

@@ -1,3 +1,11 @@
+/**
+ * @license
+ * Copyright Google Inc. All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
 import {Provider} from './index';
 import {ANY_STATE as ANY_STATE_, DEFAULT_STATE as DEFAULT_STATE_, EMPTY_STATE as EMPTY_STATE_, FILL_STYLE_FLAG as FILL_STYLE_FLAG_} from './src/animation/animation_constants';
 import {AnimationDriver as AnimationDriver_, NoOpAnimationDriver as NoOpAnimationDriver_} from './src/animation/animation_driver';