Move tailwindcss to optional peer dependencies

[MartijnHols]

Fixes#12044

Installing tailwindcss comes with a bunch of junk most people don't need, and at least prettier-plugin-tailwindcss but possibly more subdependecies are unlicensed which makes usage troublesome.

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[ioanabrooks]

Would be great to see this merged, such that issues with tailwind don't break CRA. See recent issue

[oliviertassinari]

I think Tailwind CSS should have a page in the docs with this change, e.g. https://create-react-app.dev/docs/adding-a-sass-stylesheet/

[ADTC]

Please merge this. See my comment.