onCallQualityChange property

Callback for call quality metrics updates. This will be called periodically with updated metrics when debug mode is enabled.

Example usage:

call.onCallQualityChange = (metrics) {
  print('Call quality: ${metrics.quality}');
  print('MOS: ${metrics.mos}');
  print('Jitter: ${metrics.jitter * 1000} ms');
  print('RTT: ${metrics.rtt * 1000} ms');
};