Allow "style" and "json" in as attribute for modulepreload

[KurtCattiSchmidt]

Fixes #10233

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• Tests are written and can be reviewed and commented upon at:
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• Implementation bugs are filed:
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[annevk]

Should we also disallow "json" for <link rel=preload>?

[KurtCattiSchmidt]

Should we also disallow "json" for <link rel=preload>?

You're right, "json" doesn't really make sense in preload if it's supported for modulepreload. I think this should be handled separately though, because WebKit recently added support for <link rel=preload as=json>, and we can have both for some window of time.

Filed #11995 to track and discuss separately.