Rename TaskReceiver to TaskContinuityMessageReceiver

Rename TaskReceiver to a more generic TaskContinuityMessageReceiver, and update it to flow received messages out to TaskContinuityManagerService.


Flag: android.companion.enable_task_continuity
Test: Added unit tests
Bug: 400970610
Change-Id: I477b37939c0e5d3357ccd135258014761ce12c8e
3 files changed