feat: support additional queries

[dominikg]

add support for ?raw and ?direct import queries.

fixes #341

HERE BE DRAGONS

The features described here are not meant to be used in regular libraries or end-user applications.
They can be useful for frameworks, documentation sites or in special situations, but you are responsible for applying them correctly.

Proceed with caution!

raw

//get .svelte file content as a string
import content from 'File.svelte?raw';

//get output of svelte.preprocess as {code, map, dependencies}
import preprocessed from 'File.svelte?raw&svelte&type=preprocessed';

//get output of svelte.compile js as {code, map, dependencies}
import script from 'File.svelte?raw&svelte&type=script';

//get output of svelte.compile css as {code, map }
import style from 'File.svelte?raw&svelte&type=style';

//get output of svelte.compile as {source, compiled:{js,css,preprocessed,dependencies,ast}}
import all from 'File.svelte?raw&svelte&type=all';

direct

<!-- load and execute component script -->
<script type="application/javascript" src="File.svelte?direct&svelte&type=script&lang.js" />
<!-- embed component style as css -->
<link rel="stylesheet" type="text/css" href="File.svelte?direct&svelte&type=style&lang.css" />

[bluwy]

LGTM. For ?raw with &type etc, I think we should rename ?raw to something else as Vite defines it as something that returns a string. Right now it returns an object with code and map where they can't be treeshaken if you use code only.

This could be done as another PR though as it's experimental.

[bluwy]

Mixed exports 🚀