[import-bytes] add bytes destination

[styfle]

• [import-bytes] add import bytes whatwg/html#11657
• [import-bytes] add bytes sec-fetch-dest and accept whatwg/fetch#1912
• [import-bytes] add initial tests for import bytes proposal web-platform-tests/wpt#56938

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[antosart]

Thanks for also thinking about CSP! Note that we'll likely need a WPT before landing (I think a simple test checking that connect-src applies to byte imports is fine).

[styfle]

@antosart Thanks!

I pushed 64410ac to PR web-platform-tests/wpt#56938