TimeCheck: Dump TimerThread tasks on timeout

On timeout, shows pending and retired tasks.
Fix race condition on TimerThread construction.
Split mutexes for better concurrency.
Track tasks that don't have timeout.
Enable dumping of pending requests.
Enable dumping of recent retired requests.
Format time in HH:MM:SS.MSc system_clock easier debugging.
Add default TimeCheck constructor that does nothing.

Test: atest libmediautils_test
Test: atest methodstatistics_tests
Test: atest timecheck_tests
Test: adb shell dumpsys media.audio_flinger
Test: adb shell dumpsys media.audio_policy
Test: adb shell dumpsys media.metrics
Bug: 219958414
Change-Id: I25742006578448813e557cdd20e304b9be286964