show users all the models supported by litellm

[adubatl]

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We would like to take this moment to thank inquirer for their/its service.
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Questionary seems like a more active and up to date tool, its probably overkill, but it had search yaaaay.

Its got a lot more support for robust CLI interactivity, and more importantly... it let me search a much longer model list lol.

Replaced all inquirer with questionary. There is yet another inquirer model included in the exampled poetry locks but thats not my concern just yet.

1. models are determined from the litellm package litellm.models_by_provider giving us the models in our expected format by default 🥇
2. search is enabled for the now much more thicc model list 🔍
3. a script to check that this is working is added too so you can test it and debug as we see how this works.

TODO

1. testing, the repo needs the testing love, i shouldn't start off ignoring that
2. validation - the errors are handled better by questionary IMO, but I need to add custom message text