Use ViewHierarchyAnimator to animate media container layout.

Instead of LayoutTransition.
  - The main advantage over LayoutTransition: no need for the second
    OnLayoutChangeListener. With LayoutTransition, the second
    OnLayoutChangeListener is necessary in order to disable the
    LayoutTransition.CHANGING.
  - The main disadvantage is testing. It's tricky to verify the usage of
    ViewHierarchyAnimator.Companion methods. But it's still achievable,
    via java reflect. (ViewHierarchyAnimator.Companion is essentially
    a singleton.)

The transition basially looks the same as with LayoutTransition. It does
use a different interpolator: Interpolators.STANDARD vs DECELERATE.

Other transitions tested include:
  - Same transition not in split shade
  - AOD <-> Lockscreen <-> Launcher
  - Fold / unfold, and rotate
  - Pick a different wallpaper/clock

Bug: 296907535
Test: On split shade with media, turn on/off flashlight via shortcut.
Test: With CHANGING duration = 10000, test other transitions with media.
Test: KeyguardStatusViewControllerTest
Change-Id: I9f41d75edd54196706e9f6009c9089148ffe7707