Media: Add power-systems-health utils

Used for audio power management and statistics.
This CL is library only.

Flag: com.android.media.audioserver.power_stats
Test: atest powerstats_collector_tests
Test: atest audio_powerstats_benchmark
Bug: 350114693
Change-Id: Iab8cae3f4418f86d43acef109ae7ce2776d627ca