feat: add support for multiple dprint plugins

[bitbloxhub]

• <- Keep this line and put an x between the brackts.

Description

Some dprint plugins can use other dprint plugins to format nested code. For example, you can use markup_fmt with Malva to format CSS inside of HTML, Vue, Svelte, Astro, etc., @dprint/formatter recently added an API for handling this, see https://github.com/dprint/js-formatter/tree/7f90524?tab=readme-ov-file#use.

Example config for this:

{
  files: ["**/*.svelte"],
  languageOptions: {
    parser: format.parserPlain,
  },
  plugins: {
    format,
  },
  rules: {
    "format/dprint": ["error", {
      plugins: [
        {
          plugin: "node_modules/dprint-plugin-malva/plugin.wasm",
          options: {},
        },
        {
          plugin: "node_modules/dprint-plugin-markup/plugin.wasm",
          options: {
            scriptIndent: true,
            styleIndent: true,
          },
        },
      ],
      useTabs: false,
      indentWidth: 2,
    }],
  },
}

Linked Issues

Additional context

Not sure about the API design, also we don't cache the context for multi-formatter setups.

[bitbloxhub]

@antfu Do you have any feedback on the API design or ideas about caching (which is what i am currently stuck on)?

[antfu]

We can use ohash to create a hash from the plugin+options and store the context in a map.