Feat/add gemini

[drewpayment]

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Ok @di-sukharev ! I rewrote all of the Gemini integration. It seems like a lot of changes have been happening often.

I also stopped all of the models from instantiating on app start and imported the classes so that they instantiate only if they're being used now (I hope there isn't another reason why that would have been happening before).

This should be good to merge. I think 2 of my error case tests broke while merging but will update those soon.