Create a11y menu for a bubble in bubble bar

A11y that supports the following actions:
- collapse
- dismiss
- move bar to the left or right (depending on current location)

Bug: 347028716
Test: select bubble in expanded bubble bar, open action menu
Test: use action menu to:
  - collapse bubble bar
  - dismiss a bubble, ensure only selected bubble is dismissed
  - move bubble bar to other side
Flag: com.android.wm.shell.enable_bubble_bar
Change-Id: I70d90877e045abadb1fca4665ce315476d33c713