Handle taps on bubble bar flyout

Expand the bubble bar when the user taps on the flyout view.

Flag: com.android.wm.shell.enable_bubble_bar
Bug: 277815200
Test: atest BubbleBarViewAnimatorTest
Test: atest BubbleBarFlyoutControllerTest
Change-Id: I156acfa663d6a00bc70dd7bbfc35642643902d83