Re: [heycam/webidl] Define a callback constructor type (#701)

Note that at the moment that does not have the semantics proposed above.  In particular we do not verify that the passed-in function is a constructor in the binding layer.  From the point of view of observable binding behavior it's just an alias for `callback`, but exposes a `Construct` rather than `Call` on the Gecko side.  In other words, it's Gecko developer ergonomics convenience, but without web-visible changes of any sort (which this proposal would have, due to doing `IsConstructor` checks earlier).

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