Add GitHub Models provider

[sgoedecke]

This PR adds support for the GitHub Models inference provider (GitHub's own inference API). It's OpenAI compatible and uses a GitHub PAT (or any token with the right permission) for authentication.

I'm pretty sure GitHub meets the 10k stars requirement for adding a new model, but please let me know if you'd prefer this be handled differently. I'm very happy to make any adjustments or changes.

[hyperlint-ai]

PR Change Summary

Added support for GitHub Models inference provider, enhancing compatibility with OpenAI and enabling authentication via GitHub personal access tokens.

• Introduced GitHub Models provider for inference support
• Provided usage examples for integrating GitHub Models
• Documented required permissions for GitHub personal access tokens
• Listed supported model families with their prefixes

Modified Files

• docs/models/openai.md

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[DouweM]

@sgoedecke Thanks Sean! I left a few comments, and can you please have a look at the failing test?

[DouweM]

@sgoedecke Thanks Sean! I left a few comments, and can you please have a look at the failing test?

[sgoedecke]

@DouweM Thank you for your thoughtful comments. I've pushed up some changes and fixed up the tests.