[FEAT]: Add alternative Gemini model API reference

[RahSwe]

What would you like to see?

An additional option when choosing Gemini version, pointing to the latest stable version (API "gemini-1.5-pro")

[timothycarambat]

@shatfield4 before doing this, please check if Google finally added a /models endpoint so we stop having to do these chore tasks as they update their model list randomly.

[shatfield4]

Unfortunately the only way to be able to call the models endpoint from google is to setup a Vertex project with OAuth and enabling certain scopes to be able to list all models. This is not feasible since it would require a user to set this up themselves and cannot be accessed with just a gemini API key.

Docs for REST API models list endpoint

I also found this issue on the npm package used for accessing the gemini API and it seems like it has gone stale and has not been worked on for months Link to issue