Add flag `protolog_auto_clear_incremental_state`

This flag controls whether incremental state is automatically cleared
when protologging and the incremental state starts growing too much.

Flag: android.tracing.protolog_auto_clear_incremental_state
Bug: 441704171
Change-Id: I61c86ab9c4c69f5b3b00575933810cce34e8c7e2