Integrate RecetsTaskController with shell-transition

Hook up RecentsTaskController with split screen when enabled
shell-transition. Bundle exit reason and dismiss transition together in
order to log and determine whether the dismiss should break recorded
app-pair in recents or not.

When dismissing split screen with shell-transition, it'll reparent child
tasks out of split screen before they committed invisible, so rely on
fullscreen task opening signal to update app-pair information instead
of relying on visible task appeared or changed in
FullscreenTaskListener.

Bug: 206487881
Test: atest SplitTransitionTests
Test: dump and observe recorded split pair in RecentsTaskController
Change-Id: I109d7b3b2eab2b4f691e85a2afd052f56b1a9bca