Improve logging

[streamer45]

Summary

We were missing potentially useful warnings from our logs that would ease debugging issues. Given Pion has an easy way to pass a proper logger we wrap our existing one so that everything can get printed out nicely.

Sample output:

info  [2023-07-25 16:09:31.866 -06:00] peer connection state changed: connected      caller="rtc/logger.go:70" origin="webrtc/v3.(*PeerConnection).onConnectionStateChange webrtc/peerconnection.go:495"
warn  [2023-07-25 16:09:31.867 -06:00] test warning                                  caller="rtc/logger.go:78" origin="webrtc/v3.(*PeerConnection).undeclaredMediaProcessor webrtc/peerconnection.go:1627"
error [2023-07-25 16:09:31.867 -06:00] test error                                    caller="rtc/logger.go:86" origin="webrtc/v3.(*PeerConnection).undeclaredMediaProcessor webrtc/peerconnection.go:1628"

[cpoile]

This is nice, thanks!