Stylus updater in ConnectedDevicesGroupController.

This updater is responsible for listening to USI stylus
battery usage, and bluetooth stylus connection, to determine
whether to show the USI stylus preference on the Connected devices
page.

Adds an entrypoint to the StylusUsiDetailsFragment that shows
details for USI styluses.

Bug: 250909304
Test: StylusDeviceUpdaterTest
Change-Id: I6ae6b6ef880b3b3cd7430d4d35d471b14283369f