Animate dragged bubble to full screen

When dragging a bubble to full screen we now animate the full screen
task to expand from the point where the bubble was dropped.

Flag: com.android.wm.shell.enable_bubble_to_fullscreen
Bug: 388858013
Test: atest BubbleTransitionsTest
Test: manual
       - create bubble in bubble bar
       - drag bubble to full screen
       - observe animation
Change-Id: I3226abeee180d9a8a0a6925cf22f671c05bc9b8f