oxfmt: overrides support, a.k.a language specific configuration

[shinebayar-g]

It seems it's not possible to define different configuration for different file formats? I use Prettier's overrides configuration heavily for JSON vs JS files. https://prettier.io/docs/configuration#configuration-overrides

[hi-ogawa]

Vite repo also uses overrides for json5 and yaml (though I'm not sure about the reason behind it). vitejs/vite-plugin-react#997

[leaysgur]

NOTE to self: Currently, only 1 Tailwind plugin is initialized and reused, but this feature addition will likely require caching per stylesheet or config.