Scrollbar utility classes

[endigo9740]

It seems the browser vendors are now converging on a standard syntax for scrollbar styling:

https://developer.chrome.com/docs/css-ui/scrollbar-styling#the_scrollbar-color_and_scrollbar-width_properties

This seems to match what Firefox has been doing for a while, which has been available MDN:

• scrollbar-color
• scrollbar-gutter
• scrollbar-width

I'd love to see some first class support for these from Tailwind - primarily around color, to help make it easier to handle light/dark mode styling for scrollbars.

Thanks!