feat: add astro, vue, and svelte support

[nhedger]

Summary

This PR adds the astro, vue, and svelte languages to the document filters so that they can be passed to the Biome LSP.

Description

The upcoming version of Biome introduces partial support for formatting frontmatter in Astro files and script blocks of Vue and Svelte components. This PR updates the list of document filters so that the Biome LSP takes these new file types into consideration.

Limitations

Document filters that reference vue, svelte, or astro will only work if an extension designed to handle these files is installed.

I do not expect this to be an issue, because it's fairly safe to assume that users of Astro, Vue and Svelte already use their respective VS Code extensions, which register their language identifiers.

Related Issue

This PR closes #140

Checklist

• I have tested my changes on the following platforms:
  • Windows
  • Linux
  • macOS