feat: Added Gemini as an option for users, including a menu setting t…

…o switch and set auth key (#365)

* added 'other' field to level of skill for LLM interaction (fixed #341)

* added settings option for changing LLM model

* Request JSON for Gemini LLM request

* updates to menu and function threading

* switched Gemini to Google AI js SDK

* Basic Gemini prompt functional

* Created pseudo conversation mode

* cleanup