Use KeyguardStateController to listen for unlocked shade state

Using keyguard state controller allows us to check the occlusion
state and hide / show based on that as well.

Test: manual - have screensaver turn on and ensure bubbles are hidden
Test: atest BubblesTest NewNotifPipelineBubblesTest
Bug: 223913857
Change-Id: I29992ed76c7cdd4e99b4920849c143f6520f9c42