Add androidx.core.animation dependency for better testability

Using ObjectAnimator, ValueAnimator or Interpolators from `androidx.core.animation` has the advantage of improving the testability compared to using them from `android.view.animation`. The `core-animation-testing` dependency (not included in this CL), and specifically the AnimatorTestRule (https://developer.android.com/reference/androidx/core/animation/AnimatorTestRule) allows for things such as `animatorTestRule.advanceTimeBy(500L)`. This enables us to fast forward animations and verify things that happen after an animation has ended.

Test: atest InterpolatorsAndroidXTest
Bug: 259063937
Change-Id: I196eb325e4c99dda163445e6fed84327bebecfb2