[whatwg/webidl] [SameObject]/[NewObject] should be allowed on unions and other objects (Issue #1077)

This is extracted from #71 which discusses extending `[SameObject]`/`[NewObject]` to types other than Promises:
> It should be allowed if the return value is any object type. Specifically, any interface type, "object", ~a promise,~ an Error, a DOMException, any buffer source type, or a union of types on which [NewObject] is allowed.

WebGPU in particular wants to use this on a `readonly attribute` with a union type. https://github.com/gpuweb/gpuweb/issues/1225

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