[webrtc-encoded-transform] Pull Request: Add API to request key frames

youennf has just submitted a new pull request for https://github.com/w3c/webrtc-encoded-transform:

== Add API to request key frames ==
This includes 3 different APIs:
- An API to generate a key frame from a RTCRtpScriptTransformer on sender side
- A corresponding API in RTCRtpSender. This API shares the same algorithm as the first one
- An API to request a key frame (through FIR) from a RTCRtpScriptTransformer on receiver side

See https://github.com/w3c/webrtc-encoded-transform/pull/125


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