[whatwg/webidl] Propagate a type's extended attributes to a nullable inner type (PR #1624)

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This patch makes types such as `[Clamp] long?` legal, propagating the extended attribute to the inner type of the nullable type.

It relaxes the definitions of `[AllowResizable]`, `[AllowShared]`, `[Clamp]` and `[EnforceRange]` so that they can be used as such; while it leaves `[LegacyNullToEmptyString]` as is since it does not really make sense to apply it to a nullable string (since then the attribute would be a no-op, given that the null is already handled).

Closes #670.

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My motivation for doing this is that I will need it in https://github.com/whatwg/webidl/pull/1568.

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You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/webidl/pull/1624

-- Commit Summary --

  * Propagate a type's extended attributes to a nullable inner type

-- File Changes --

    M index.bs (26)

-- Patch Links --

https://github.com/whatwg/webidl/pull/1624.patch
https://github.com/whatwg/webidl/pull/1624.diff

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