feat(angular): Expose Ionic Animations via the AnimationController (#19745)

* Add animation controller for angular

* remove empty constructor

* sync with master

angular/src/index.ts

@@ -30,6 +30,7 @@ export { ToastController } from './providers/toast-controller';
 export { NavController } from './providers/nav-controller';
 export { DomController } from './providers/dom-controller';
 export { Config } from './providers/config';
+export { AnimationController } from './providers/animation-controller';
 
 // ROUTER STRATEGY
 export { IonicRouteStrategy } from './util/ionic-router-reuse-strategy';