Refactor ai utils

[Anna-Xiong]

Description

• Clean up VizroAI, move helper functions in utils

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[Anna-Xiong]

Hey @Anna-Xiong - thanks for tidying up - I always appreciate that!

Have some minor comments as I've just been reading through this code for the first time. Really up to you, whether you want to do a bit more refactoring while you're already on it, or if you just want to keep the PR as moving code to other files. I am fine either way 👍

It would help if the comments/todos have a bit more context? Just in case someone else would pick this up 😄

thank you Li! Most of this pr is to move helpers so that new pr can reuse those functions, but definitely worth addressing those comments while we can. i have addressed some of them and probably two of them need a bit more discussion/time to refine.