feat(plugin-stylus): add support for raw query

[chenjiahan]

Summary

Supports importing raw Stylus files as strings in JavaScript by using the ?raw query parameter:

import rawStylus from './style.styl?raw';

console.log(rawStylus); // Output the raw content of the Stylus file

Related Links

#4841

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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