PTS-bot: add default timeout and AVDTP tests

- Add a 60s default timeout on all gRPC test methods to avoid
  blocking the execution.
- Add AVDTP tests.

Test: atest pts-bot
Bug: 241962982
Ignore-AOSP-First: Cherry-picked from AOSP
Merged-In: Id6dabb81ab38083c534aa57a6942a6c98e8149c3
Change-Id: Id6dabb81ab38083c534aa57a6942a6c98e8149c3