Reland "Introduce TaskFragment transition type"

Previously AppTransitionController didn't recognize TaskFragment
transitions, so it uses Task opening/closing animation for
TaskFragment transitions.
This CL introduces and uses TaskFragment transition if the animation
target is TaskFragment. The new transition type can be used for registering
RemoteAnimation implemented by TaskFragmentOrganizer as well.
It also provides a fallback mechanism for TaskFragment transitions
if the RemoteAnimation fails or one of opening/closing animation target
is not a pure organized TaskFragment.

Note that previous reverted CL[1] didn't cover the case that the
animation target is promoted to TaskDisplayArea. This CL fixes it by
introducing WindowContainer#canBeAnimationTarget to filter out the case.

Bug: 194649929
Test: manual - the reproducible step in b/194649929#comment1
Test: atest WmTests:AppTransitionTests AppTransitionControllerTest
Test: atest MultiDisplayPolicyTests#testAppTransitionForActivityOnDifferentDisplay
[1]: I0094694fa5cd95d8bbb7da94d2aaf7aac6e1fe09

Change-Id: I5520803f3018d2dd67c96db55daceef740b2cf0b