Handle PLI#52
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TomFanella4 wants to merge 3 commits intolivekit:mainfrom
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This PR replaces a TODO comment with a full implementation of keyframe request handling. When a PictureLossIndication or FullIntraRequest RTCP packet is received, the publisher track now sends a GstForceKeyUnit upstream event through the GStreamer pipeline to the encoder.
Requests are rate-limited to at most one every 500ms using an atomic CAS on lastKeyframeRequestNs, and audio tracks (Opus) are skipped entirely.