[webrtc-stats] new commits pushed by henbos

The following commits were just pushed by henbos to https://github.com/w3c/webrtc-stats:

* Remove most unimplemented stats (#622)

* Delete most stats

* Restore estimatedPlayoutTimestamp

* Restored some metrics that should not have been removed

* More restoration

* Revive sentence

* Fix errors
  by henbos

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Received on Thursday, 9 June 2022 11:19:50 UTC