audio/baresip: Add new modules and improve option consistency
- Add modules for:
- Codec2 - low-bitrate speech codec;
- evdev input support;
- PipeWire and sndio sound backends;
- in_band_dtmf and augain audio filters;
- WebRTC Acoustic Echo Cancellation.
- Unbreak D-Bus module.
- Build opus_multistream along with opus module.
- Standardize option names and remove redundant descriptions of common options for better sanitization.
PR: 290367