Support for prettier plugins

Is your feature request related to a problem? Please describe.
Previously we had to format our liquid files with prettier, but with the v2 of the Shopify Liquid extension, we use theme-check to format our liquid files. This will make it impossible to use prettier-plugin-tailwindcss to automatically order our tailwind classes.

Describe the solution you'd like
Make sure we can use prettier plugins, so we can easily extend the theme-check formatter.

Describe alternatives you've considered
Give the option to either use a prettier plugin or the extension (with plugins).

Checklist

• [ x] I have checked and made sure that the proposal adheres to this plugin's principles

I also opened an issue on the repo of the Shopify Liquid extension.

Start by reading packages/prettier-plugin-liquid and its principles at docs/prettier-plugin-liquid/principles/index.md. Determine how the formatter currently handles extensions, then define what plugin support must cover, including prettier-plugin-tailwindcss or an extension-provided plugin. Done means the requested plugin can be used to order Tailwind classes without losing Liquid formatting.