Update bubble bar to match visual spec

Made bubble bar icon size adjustable and listen to the task bar
icon size changes. Additionally fixes an issue where the pointer arrow
could be misplaced.

Test: BubbleBarViewAnimatorTest.kt
Flag: ACONFIG com.android.wm.shell.enable_bubble_bar DEVELOPMENT
Bug: 295027436
Fixes: 334781761
Change-Id: Ie4ceee84cc00baa0186a3d5b431080c8495c7285