Integrated new BubbleStashControllers into the existing code.

Integrated the PersistentTaskbarStashController and the
TransientTaskbarStashController into the launcher code. Made changes to
the TaskbarInsetsController to set appropriate touchable zones. Updated
the TaskbarUIController to not start the overview transition on clicks
for the collapsed bubble bar.

Bug: 346391377
Fixes: 350065038
Fixes: 355664783
Flag: com.android.wm.shell.enable_bubble_bar_in_persistent_task_bar
Test: com.android.launcher3.taskbar package tests

persistent taskbar and transient taskbar manual testing:
- on launcher home screen expand bubble bar, switch between bubbles,
remove bubble via bubble menu, add bubble, remove bubble with the drug
gesture, add bubble, collapse bubble bar
- repeat previous test on launcher overview screen and inside any
application
- after last test drag expanded bubble view to the opposite side of the
screen

Change-Id: I50f2c510854c4895fdfc9bd453a261c2103286fd