feat(css): add support for inline CSS imports

[chenjiahan]

Summary

Supports importing transformed CSS files as strings in JavaScript by using the ?inline query parameter:

import inlineCss from './style.css?inline';

console.log(inlineCss); // Output the inline content of the CSS file

Related Links

• [Feature]: Importing CSS as a String or a URL #4562
• [Feature]: Support ?raw and ?inline via import assertion #3778

Checklist

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

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