Reintroduce container component as a utility

[philipp-spiess]

Closes #13129

We're adding back the v3 container component, this time as a utility. The idea is that we support the default container behavior but we will not have an API to configure this similar to what v3 offered. Instead, the recommended approach is to configure it by creating a custom utility like so:

@import "tailwindcss";

@utility container {
  margin-left: auto;
  margin-right: auto;
  padding-left: 2rem;
  padding-right: 2rem;
}

We do have an idea of how to migrate existing JS configuration files to the new @utility as part of the interop layer and the codemod. This is going to be a follow-up PR though.

Test Plan

We added a unit test but we've also played around with it in the Vite playground. Yep, looks like a container:

Screen.Recording.2024-11-13.at.17.43.08.mov