Add public ADPF load hints with better rate limiter and hint batching

- Adds ADPF public load hint NDK API
- Updates rate limiter to use a single budget for all load hints
- Adds support for load hint batching, to send multiple hints at a time
- Requires users of load hints to annotate their hints for better traces

Bug: 367803904
Test: atest HintManagerServiceTest
Test: atest PerformanceHintNativeTestCases
Flag: android.os.adpf_use_load_hints

Change-Id: I08502599aff0471bd73adc586245da2c924d24e0