refactor(animations): ensure animation input/outputs are managed within the template parser (#11782)

Closes #11782
Closes #11601
Related #11707

modules/@angular/core/src/animation/animation_output.ts

@@ -1,10 +0,0 @@
-/**
- * @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
- */
-export class AnimationOutput {
-  constructor(public name: string, public phase: string, public fullPropertyName: string) {}
-}