Log O AIModels config on startup

[eliteprox]

What does this pull request do? Explain your changes. (required) This change logs each advertised capability, model and price from the aiModels config when log level of info or debug is used.

Sample log lines:

I0423 23:44:26.940464  544271 starter.go:601] Capability text-to-image (ID: 27) advertised with model constraint ByteDance/SDXL-Lightning at price 4768371 per 1 unit
I0423 23:44:26.940511  544271 starter.go:601] Capability image-to-image (ID: 28) advertised with model constraint ByteDance/SDXL-Lightning at price 4768371 per 1 unit
I0423 23:44:26.940530  544271 starter.go:601] Capability image-to-video (ID: 29) advertised with model constraint stabilityai/stable-video-diffusion-img2vid-xt-1-1 at price 3390842 per 1 unit

Specific updates (required)

• Updates starter.go, adding a new log line after the aiModels.json config is loaded when -v 6 is used.

How did you test each of these updates (required)

• Loaded go-livepeer in orchestrator mode with -aiWorker and -aiModels config containing multiple models with different prices. Log result is shown above.

Does this pull request close any open issues?

Checklist:

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