Gemini 2.0 is out, let's support it

[samuelcolvin]

https://blog.google/products/gemini/google-gemini-ai-collection-2024/

Should be relatively simple to test if it works. No idea how much work it'll require to support it, but hopefully none.

[janas-adam]

tried gemini-2.0-flash with simply extended literal GeminiModelName
-> got 404 from https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash:generateContent

{
  "error": {
    "code": 404,
    "message": "models/gemini-2.0-flash is not found for API version v1beta, or is not supported for generateContent. Call ListModels to see the list of available models and their supported methods.",
    "status": "NOT_FOUND"
  }
}

[sydney-runkle]

Done :)