feat: add support for OpenAI and Gemini LLM providers (#2299)

[IkramBagban]

Description

Added support for additional LLM providers: OpenAI and Google Gemini

Related Issues

closes #2299

Type of Change

• [ ] Bug fix
• [x] New feature
• [ ] Documentation update
• [ ] Release
• [ ] Refactor
• [ ] Other (please describe):

Testing

Screenshots (if applicable)

Additional Notes

---

[!IMPORTANT] Adds support for OpenAI and Google Gemini LLM providers, updating environment variables, dependencies, and provider initialization logic.

• Behavior:
  • Adds support for OpenAI and Google Gemini LLM providers in providers.ts.
  • Requires OPENAI_API_KEY and GOOGLE_API_KEY in .env.example.
• Dependencies:
  • Adds @ai-sdk/google and @ai-sdk/openai to package.json.
• Models:
  • Adds OPENAI_MODELS and GEMINI_MODELS enums in index.ts.
• Functions:
  • Adds getOpenAIProvider() and getGoogleProvider() in providers.ts.

^{This description was created by for 8c2bc7464a0c4b3799e7138abb93ce5547f387a8. You can customize this summary. It will automatically update as commits are pushed.}

[vercel[bot]]

@IkramBagban is attempting to deploy a commit to the Onlook Team on Vercel.

A member of the Team first needs to authorize it.

[IkramBagban]

Hey @ashu565 @Kitenite, please check now

[ashu565]

This looks great now! If possible, could you please share a screenshot or a short video demo of it in action? I'd be happy to test it on my end as well and share a screenshot if that helps.

[Kitenite]

Thanks @IkramBagban for the nice PR! And @ashu565 for helping with the review :)