Added new SpringObjectAnimator class that wraps an ObjectAnimator so the
Object can be controlled via the Animator or via a SpringAnimation. It extends
ValueAnimator so that it remains compatible with AnimatorPlaybackController.
Code is behind feature flag toggle QUICKSTEP_SPRINGS.
Bug: 111698021
Change-Id: I1b20179ede37e89a6a6bb2a45d407cc74c99ac4e