ai/live: Send param updates to Kafka from the control handler.

[j0sh]

This mitigates some observability issues with param updates not being reported to Kafka since they were removed in [1].

[1] livepeer/ai-runner#723

The event fields were based on:

https://github.com/livepeer/ai-runner/blob/acff3a3be0c9235473ca69ed5fdc241e2af4a3b0/runner/app/live/streamer/process_guardian.py#L121-L132

and

go-livepeer/server/ai_live_video.go

Lines 689 to 691 in 1b6298d

	event["stream_id"] = streamId
	event["request_id"] = params.liveParams.requestID
	event["pipeline_id"] = params.liveParams.pipelineID

[codecov]

Codecov Report

❌ Patch coverage is 0% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 31.66474%. Comparing base (34e8e88) to head (515e965).
⚠️ Report is 172 commits behind head on master.

Files with missing lines	Patch %	Lines
server/ai_live_video.go	0.00000%	19 Missing ⚠️
server/ai_mediaserver.go	0.00000%	5 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master       #3713         +/-   ##
===================================================
- Coverage   31.68433%   31.66474%   -0.01959%     
===================================================
  Files            158         158                 
  Lines          47645       47665         +20     
===================================================
- Hits           15096       15093          -3     
- Misses         31654       31677         +23     
  Partials         895         895                 

Files with missing lines	Coverage Δ
core/livepeernode.go	60.22099% <ø> (ø)
server/ai_mediaserver.go	4.65549% <0.00000%> (-0.01304%)	⬇️
server/ai_live_video.go	0.00000% <0.00000%> (ø)

... and 3 files with indirect coverage changes

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Files with missing lines	Coverage Δ
core/livepeernode.go	60.22099% <ø> (ø)
server/ai_mediaserver.go	4.65549% <0.00000%> (-0.01304%)	⬇️
server/ai_live_video.go	0.00000% <0.00000%> (ø)

... and 3 files with indirect coverage changes

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