* Simplifying (hopefully) sfu.DownTrack
* Remove unnecessary check as pdding only packets are dropped before that check
* Temporal filtering max layer
* - Split out forwarder bits into a separate structure
- Address comments from Jie and David
* Remove debug and unneeded stuff
* Fix test
* Remove unneeded default initialization
* Separate from ion-sfu
changes:
1. extract pkg/buffer, twcc, sfu, relay, stats, logger
2. to solve cycle import, move ion-sfu/pkg/logger to pkg/sfu/logger
3. replace pion/ion-sfu => ./
reason: will change import pion/ion-sfu/pkg/* to livekit-server/pkg/*
after this pr merged. Just not change any code in this pr, because it
will confused with the separate code from ion-sfu in review.
* Move code from ion-sfu to pkg/sfu
* fix build error for resovle conflict
Co-authored-by: cnderrauber <zengjie9004@gmail.com>
