[3.x] Region select

[Jade-GG]

In Magento, for some countries it may be required to add a region (this is customizable in the configuration). Because it is possible---and we ran into a case where it's necessary---I have implemented a basic version here.

Because of the way we structured input components, it seemed cleanest to me to use a has selector to hide the region select when there are no regions. This is, however, only supported in browsers from 2023 and later. Older browsers will see an empty "region" block, which is not breaking. Also requires a tailwindcss version bump (from ^3.3.3 to ^3.4).

This will also have to be added into checkout-theme (and confira).

[royduin]

Looking good to me, let's wait for @indykoning his review.

[royduin]

We also need this within:

• rapidez/account
• rapidez/checkout-theme
• rapidez/confira

Is there a follow-up? Should we merge this one first?

[Jade-GG]

We also need this within:

* rapidez/account

* rapidez/checkout-theme

* rapidez/confira

Is there a follow-up? Should we merge this one first?

Correct, I will follow up on these after this one has been approved. Looks like it has been approved now, so expect these pull requests soon™