[w3c/uievents] Consider integrating InputDeviceCapabilities (#108)

The `sourceCapabilities` property of `UIEvent` was [incubated in the WICG](https://github.com/WICG/InputDeviceCapabilities).  If this API becomes successful (eg. widely used by developers / implemented in more than one browser), then we should consider transitioning it out of incubation and into this spec.


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