[RESTRICT AUTOMERGE]BackGestureAnimation: a lightweight recents

animation controller

Copy most of code from RecentsAnimationController to back gesture
animation controller(BackNaviAnimationController), the infrastructure
can be reused for either back-to-home/back-to-task/back-to-activity
animations if needed. Since the infrasturcture of legacy recents
animation controller should be stable already, we don't need to
worry about issues like leak leashes/flickers/fixed rotation.

BackAnimationAdaptor is a temporary class to help migrate to shell
transition, the target is to replace it by RemoteTransition.

Next step: Migrate to shell transition, decouple animation info from
BackNavigationInfo.
Test: manually play back to home animation to verify no flicker/black
background/leak surface. Also test that there can play back to home
animation even when quick swipe.
Test: atest BackNavigationTest
Test: atest BackNavigationControllerTests BackAnimationControllerTest
Bug: 237642535

Change-Id: I436a3dcf5011c56c08d131b40168f19128cc8723