Make recents transition wrapper implement IRAC

This is the correct model, RecentsAnimationControllerCompat is
supposed to wrap this interface, not the other way around. Correcting
the relationship to make refactoring easier.

Bug: 267738124
Test: no logic change, existing tests pass
Change-Id: I7d8b09deb0a1ebd6c0eff946c468b3d74e2c47e2