AI: add data url

[ad-astra-video]

What does this pull request do? Explain your changes. (required)

Add data url to trickle server to enable sending data up from ai-runner inference (e.g. transcriptions)

Also adds a SSE endpoint to gateway to be able to get the data for the stream. If preferred, can move the SSE endpoint to separate URL. Just no easy way to test the data_url without it so included it here.

Depends on livepeer/ai-runner#710

Specific updates (required)

• add data_url to Orchestrator trickle server
• add SSE endpoint as simple way to get data from a stream

How did you test each of these updates (required)

Built and ran full stack locally using: https://github.com/ad-astra-video/livepeer-app-pipelines/tree/main/comfystream

Does this pull request close any open issues?

Checklist:

• Read the contribution guide
• make runs successfully
• All tests in ./test.sh pass
• README and other documentation updated
• Pending changelog updated

[codecov]

Codecov Report

❌ Patch coverage is 2.02020% with 194 lines in your changes missing coverage. Please review.
✅ Project coverage is 31.82047%. Comparing base (a50ac9f) to head (0dc72c4).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
server/ai_live_video.go	0.00000%	108 Missing ⚠️
server/ai_mediaserver.go	4.76190%	79 Missing and 1 partial ⚠️
server/ai_http.go	0.00000%	6 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master       #3689         +/-   ##
===================================================
- Coverage   31.94567%   31.82047%   -0.12520%     
===================================================
  Files            156         156                 
  Lines          47418       47614        +196     
===================================================
+ Hits           15148       15151          +3     
- Misses         31376       31568        +192     
- Partials         894         895          +1     

Files with missing lines	Coverage Δ
ai/worker/runner.gen.go	7.23104% <ø> (ø)
core/livepeernode.go	60.22099% <ø> (ø)
server/ai_http.go	9.58084% <0.00000%> (-0.08683%)	⬇️
server/ai_mediaserver.go	4.68750% <4.76190%> (+0.01023%)	⬆️
server/ai_live_video.go	0.00000% <0.00000%> (ø)

... and 1 file with indirect coverage changes

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Files with missing lines	Coverage Δ
ai/worker/runner.gen.go	7.23104% <ø> (ø)
core/livepeernode.go	60.22099% <ø> (ø)
server/ai_http.go	9.58084% <0.00000%> (-0.08683%)	⬇️
server/ai_mediaserver.go	4.68750% <4.76190%> (+0.01023%)	⬆️
server/ai_live_video.go	0.00000% <0.00000%> (ø)

... and 1 file with indirect coverage changes

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