✨ Svelte language syntax support (.svelte)

### Is your feature request related to a problem? Please describe.

_No response_

### Describe the solution you'd like

Add syntax highlighting for .svelte files

### Describe alternatives you've considered

This could perhaps be an extension but it's more akin to the first class support JSX files currently have

### Additional context

Theres a svelte language project that you may be able to take and implement rather than writing from scratch.

https://github.com/sveltejs/language-tools