Merge changes Iccedaa82,I1c1d26c8,I73d27d19,I69c6eb12,Iec42588c into main

* changes:
  Handle existed source first, then handle QR code.
  Start scanning with filter when entering WAIT_FOR_SYNC state, then restart scan without filter when exiting.
  Implement scan with filter and restart scan without filter.
  Create new state `SourceLostState`.
  Creates a helper class to handle audio stream scanning.