ai/worker: Absorb ai-worker library

[victorges]

What does this pull request do? Explain your changes. (required)
This is to move the Go logic from livepeer/ai-worker repository into a separate package
in this repository (the only consumer).

This will allow livepeer/ai-worker to be renamed to ai-runner and avoid any
maintenance confusion, keeping only the specific AI runner container logic on it.

Specific updates (required)

• Create package which current version of ai-worker worker package (needs update after some PRs get merged there)
• Replace references and remove go.mod dependency
• Copy Makefile command to generate runner.gen.go API bindings
• Create short package doc.go based on the relevant README bits from livepeer/ai-worker

How did you test each of these updates (required)
If it builds it works. No code changes.

Does this pull request close any open issues?
No.

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

Attention: Patch coverage is 24.87771% with 1075 lines in your changes missing coverage. Please review.

Project coverage is 32.30971%. Comparing base (4d09ba7) to head (01eda1a).

Files with missing lines	Patch %	Lines
ai/worker/worker.go	0.00000%	609 Missing ⚠️
ai/worker/multipart.go	0.00000%	316 Missing ⚠️
ai/worker/docker.go	74.39614%	82 Missing and 24 partials ⚠️
ai/worker/container.go	43.85965%	27 Missing and 5 partials ⚠️
ai/worker/b64.go	65.71429%	10 Missing and 2 partials ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##              master       #3345         +/-   ##
===================================================
- Coverage   33.73413%   32.30971%   -1.42442%     
===================================================
  Files            141         147          +6     
  Lines          37425       40477       +3052     
===================================================
+ Hits           12625       13078        +453     
- Misses         24079       26630       +2551     
- Partials         721         769         +48     

Files with missing lines	Coverage Δ
ai/file_worker.go	0.00000% <ø> (ø)
ai/worker/runner.gen.go	5.98396% <ø> (ø)
cmd/livepeer/starter/starter.go	7.51409% <ø> (ø)
core/ai.go	58.51852% <ø> (ø)
core/ai_orchestrator.go	31.06796% <ø> (ø)
server/ai_http.go	9.98440% <ø> (ø)
server/ai_mediaserver.go	7.81250% <ø> (ø)
server/ai_process.go	0.59778% <ø> (ø)
server/ai_worker.go	49.89059% <ø> (ø)
server/rpc.go	66.66667% <ø> (ø)
... and 5 more

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Files with missing lines	Coverage Δ
ai/file_worker.go	0.00000% <ø> (ø)
ai/worker/runner.gen.go	5.98396% <ø> (ø)
cmd/livepeer/starter/starter.go	7.51409% <ø> (ø)
core/ai.go	58.51852% <ø> (ø)
core/ai_orchestrator.go	31.06796% <ø> (ø)
server/ai_http.go	9.98440% <ø> (ø)
server/ai_mediaserver.go	7.81250% <ø> (ø)
server/ai_process.go	0.59778% <ø> (ø)
server/ai_worker.go	49.89059% <ø> (ø)
server/rpc.go	66.66667% <ø> (ø)
... and 5 more