Create RotaryInputValueView to display the most recent rotary input value.

It also indicates whether the user is actively giving a rotary input by
changing its background. This CL merges a lot of CLs that were
originally created in tm-wear-dev. Link to original CLs:
go/RotaryInputValueView-upstreaming

Demo: go/rotary-vis-on-main-demo-1
Bug: 286086154
Test: manual, atest FocusEventDebugViewTest
Change-Id: I598f9c2b1428af6d930c62b5f89882012c01fbb5