Create a11y action menu for app handle in bubbles

Following actions are available:
* collapse
* dismiss
* move left/right

Bug: 357933784
Flag: com.android.wm.shell.enable_bubble_bar
Test: open action menu from app handle, test that a bubble can be
  collapsed, dismissed and moved left or right depending which side of
  the screen the bubble is on
Change-Id: I43abbdbecf66c19f298ac752820b5a5ed30059be