fixup! refactor(cdk-experimental/ui-patterns): create event manager index file

Author: wagnermaciel

src/cdk-experimental/ui-patterns/behaviors/event-manager/index.ts

@@ -1,3 +1,11 @@
+/**
+ * @license
+ * Copyright Google LLC 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.dev/license
+ */
+
 export {ModifierKey} from './event-manager';
 export {KeyboardEventManager} from './keyboard-event-manager';
 export {PointerEventManager} from './pointer-event-manager';