Add app window unfold animation

Creates a controller in the Shell that manipulates
SurfaceControl leash of the current active full
screen task and animates it based on the current
unfold transition progress.

Bug: 193795714
Test: manual
Test: atest com.android.wm.shell.fullscreen.FullscreenTaskListenerTest
Change-Id: I8b9f4e0530042b333c3b6b793d39049932878bb8