[w3c/gamepad] `navigator.getGamepads()` should return a `Promise` (#23)

Perhaps this is a dupe of #17, and perhaps this should first be discussed on the mailing list, but I think `navigator.getGamepads()` should return a `Promise` resolving an array of `Gamepad` objects (instead of returning the array, per the current spec + implementations).

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https://github.com/w3c/gamepad/issues/23