This PR adds support for handling v3 [`container` customizations
](https://tailwindcss.com/docs/container#customizing). This is done by
adding a custom utility to extend the core `container` utility. A
concrete example can be taken from the added integration test.
### Input
```ts
/** @type {import('tailwindcss').Config} */
export default {
content: ['./src/**/*.html'],
theme: {
container: {
center: true,
padding: {
DEFAULT: '2rem',
'2xl': '4rem',
},
screens: {
md: '48rem', // Matches a default --breakpoint
xl: '1280px',
'2xl': '1536px',
},
},
},
}
```
### Output
```css
@import "tailwindcss";
@utility container {
margin-inline: auto;
padding-inline: 2rem;
@media (width >= theme(--breakpoint-sm)) {
max-width: none;
}
@media (width >= 48rem) {
max-width: 48rem;
}
@media (width >= 1280px) {
max-width: 1280px;
}
@media (width >= 1536px) {
max-width: 1536px;
padding-inline: 4rem;
}
}
````
## Test Plan
This PR adds extensive tests to the compat layer as part of unit tests.
Additionally it does at a test to the codemod setup that shows that the
right `@utility` code is generated. Furthermore I compared the
implementation against v3 on both the compat layer and the custom
`@utility`:
https://github.com/user-attachments/assets/44d6cbfb-4861-4225-9593-602b719f628f
890f18de93