- Introduced a new RTSP relay server that allows WHIP streams to be served over RTSP.
- Added `RTSPRelayAddr` configuration option to enable the RTSP relay.
- Implemented methods for updating codec parameters and forwarding RTP packets to RTSP clients.
- Enhanced the WHIP server to handle RTSP connections and manage multiple clients.
- Added comprehensive tests for RTSP relay functionality, including OPTIONS, DESCRIBE, SETUP, PLAY, and TEARDOWN requests.