Generate progress events from app process for app animations.

The goal is to address touch latency when apps should handle
back. Main changes invovled:
- SysUI now only steals pointers from apps when the back navigation type is home, another activity or another task.
- Previously apps receive an ACTION_CANCEL when the back threshold is crossed. To keep behavior the same, we now generate this from the app process, by having the DecorView returning true from onInterceptTouchEvent when it should.
- We now track touch and compute progress from the app process when back nav type is APP_CALLBACK.

Bug: 261654570
Test: atest BackNavigationControllerTest
Test: atest OnBackInvokedCallbackGestureTest
Test: atest BackAnimationControllerTest
Test: atest BackTouchTrackerTest
Test: atest WindowOnBackInvokedDispatcherTest
Flag: None

Change-Id: Iab6a97ff6316367de83ad32ca87879d8a4c995f3