Create 'aicodebot setup' command

[TechNickAI]

Right now each of the functions calls setup_environment() that walks the user through getting an API key. It would be nice to have this be an actually command so we could run aicodebot setup

This would:
[X] Gather the user's OPEN AI API KEY
[ ] Test that it works by doing a call
[ ] Check if the user's API supports gpt-4, and use that if available, if not, set the OPENAI_DEFAULT_MODEL to gpt-3.5-turbo

Effectively guiding them through creating the .aidcodebot config file