Add bundle option

[jonnitto]

According to https://lightningcss.dev/bundling.html, bundle need to be imported for bundling CSS files. Otherwise @import will not bundling the files. Would it be possible to also import import { bundle } from 'lightningcss'; and run it through this function if bundle is enabled? As bundle is not an option from lightningcss, it should find its place on top level, besides browsers.

What do you think?