feat(animations): introduce a wave of new animation features

packages/animations/src/animation_builder.ts

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+/**
+ * @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 {AnimationMetadata, AnimationOptions} from './animation_metadata';
+import {AnimationPlayer} from './players/animation_player';
+
+/**
+ * @experimental Animation support is experimental.
+ */
+export abstract class AnimationBuilder {
+  abstract build(animation: AnimationMetadata|AnimationMetadata[]): Animation;
+}
+
+/**
+ * @experimental Animation support is experimental.
+ */
+export abstract class Animation {
+  abstract create(element: any, options?: AnimationOptions): AnimationPlayer;
+}