Philipp Spiess a7ebc9cda1
Expose flattenColorPalette (#15318)
Resolves #15315 

It looks like we implemented this in Core but forgot to expose it from
the distributed package (the references are only used for testing
plugins internally right now). This exposes `flattenColorPalette` under
the old import path of `tailwindcss/lib/util/flattenColorPalette`.

## Test Plan

Added the following plugin to the Vite example and ensured it works as
expected:

```ts
import flattenColorPalette from 'tailwindcss/lib/util/flattenColorPalette'
import plugin from 'tailwindcss/plugin'

export default plugin(({ matchUtilities, theme }) => {
  matchUtilities(
    {
      'hover-bg': (value) => {
        return {
          '&:hover': {
            backgroundColor: value,
          },
        }
      },
    },
    { values: flattenColorPalette(theme('colors')) },
  )
})
```

<img width="462" alt="Screenshot 2024-12-06 at 11 47 44"
src="https://github.com/user-attachments/assets/11163390-053e-4c6e-8cb9-ae67184ad594">
2024-12-09 11:33:19 +01:00
..
2024-03-05 14:29:15 +01:00