Class/Tailwind support on Box component

[ducan-ne]

Is your feature request related to a problem? Please describe.
as mentioned in #123. As a dev has properly understood the web app. I want to reuse my web skills to mesop instead of writing raw styles.

Describe the solution you'd like
Support for passing classes to Box would be great.

[wwwillchen]

I prototyped this: #476, but there's a few hurdles which I've noted in the PR. I'm going to mark this as votes needed and see if more people want this before investing more into this. I know tailwind is very popular in the FE community, but it also seems quite duplicative with Mesop's Style API and I think most of the use cases that Tailwind does can be covered already (there's some exceptions like state selector, pseudo classes, and groups).