Move stylus first usage detection into StylusManager.

Instead of being its own separate CoreStartable, first stylus use
detection is now part of StylusManager. This means features needing this
information are now responsible for starting and listening to the StylusManager.

Battery listeners are also no longer unregistered upon first stylus use,
as now, it triggers the StylusBatteryCallback, which will be needed for
USI low battery detection.

Bug: 251206662
Test: atest StylusManagerTest
Change-Id: I120fd0e35ee92483bdce90a27d5f1d38ef60b4d5