Rewire ProgramInfo updates for 1 HAL : N AIDL fanout

This change completes the refactor to enable multi-AIDL client support on the v2
BroadcastRadioService:
- Adds incremental updating to ProgramInfoCache as requested on ag/6922213.
- TunerSession now maintains a ProgramInfoCache as a view of the state
transmitted to the AIDL client.
- RadioModule also has a ProgramInfoCache as a view of the state
received from the HAL.
- The two classes communicate with each other to propagate changes in
filters or ProgramInfos.

This change also makes the following framework changes:
- Overrides ProgramList.Filter#equals() and #hashCode().
- Addresses an oversight from ag/6922213, where RadioMetadata#hashCode() should have been overridden.

Bug: 126887436
Bug: 121305828
Test: atest com.android.server.broadcastradio.hal2.StartProgramListUpdatesFanoutTest atest com.android.server.broadcastradio.hal2.ProgramInfoCacheTest
Change-Id: I03b0b60b30c01ed03d3a86cff105f2efe830b233