This is the first step towards generating all utility classes with
tailwind. The idea behind this is the following:

Parse all utility classes being provided by @gitlab/ui into a JSON
object where each class is represented as something like this:

```
'.bg-gray-10': {
  'background-color': 'var(--gray-10, #fbfafd)',
},
```

We then let tailwind generate all the utilities and compare the class
definitions above with the class definitions in @gitlab/ui. They can
fall into four categories:

- exact matches: The tailwind generated class matches @gitlab/ui 1:1
- potential mismatches: The tailwind generated class mismatches
  significantly. This can be okay or we may need some adjustments to the
  tailwind config.
- hardcoded colors: Some of the utility classes have hard coded colors
  which the conversion script is not able to resolve to a CSS variable.
- safe to use legacy utils: These utils have no overlap with tailwind at
  all. The class names completely differ....