Re: [heycam/webidl] NonAnyType vs SingleType as home of PromiseType ε alternative (#740)

My gut feeling is that we should rename `NonAnyType` to `MaybeDistinguishableType` or `DistinguishableType` or something like that to make it clear what it's really about, and move the `Promise` bit into `SingleType`, as @bathos proposes.

(In addition to being theoretically fine, I just tried making that change in Gecko, and it's fine in practice too, as far as any of our tests are concerned.)

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