[CS] 2/4: Have NotificationLogger listen to shade/LS visibility directly

Removes some CentralSurfaces logic by having NotificationLogger listen
directly to WindowRootViewVisibilityInteractor instead of requiring
CentralSurfaces to notify NotificationLogger.

Also removes some NotificationLogger internal logic around starting &
stopping logging. When I added some debug logging, the CentralSurfaces
calls to start/stop logging were *always* happening at the same cadence
as the internal NotificationLogger tracking. So, I removed the internal
tracking to have NotificationLogger use only one source of truth.

Bug: 296050180
Test: manual: verified via logging that notif logging starts when device
wakes to lockscreen or when shade is pulled down while unlocked.
Verified notif logging stops when on bouncer, device is unlocked, or
device goes to sleep.
Test: atest NotificationLoggerTest CentralSurfacesImplTest

Change-Id: Id05ddf681d42b5185517faf2689761ac36bfff8a