Enhancement: Supermaven Support

### Before Requesting

- [X] I have searched the existing issues, and there is no existing issue for my feature request

### What feature do you want?

I'd love support for [Supermaven](https://supermaven.com)

It has an excellent free plan, and a super long context on the paid plan. I'm pinging their team to see if there's an API (nothing public) or interest.