Feature suggestion: runOnUnready

[sgofferj]

Describe the feature

I'd like to suggest a runOnUnready configuration directive which triggers when a stream that was ready becomes unready, i.e. the publisher has stopped publishing to the path. The purpose for that would be to enable calls to webhooks or similar if a stream becomes unavailable, e.g.

runOnReady: curl -X POST -d "$RTSP_PATH" http://server/api/start
runOnUnready: curl -X POST -d "$RTSP_PATH" http://server/api/stop

[aler9]

duplicate of #1464

[github-actions]

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