[w3c/uievents] Pen Button Events (#237)

Moving [this](https://github.com/w3c/pointerevents/issues/290) issue into UI events as it seems to be a more appropriate place for it. @garykac  let me know if you disagree.

To reiterate though:
Today, it is impossible for a web app to detect when an user presses the top button on a surface pen. Native apps like PowerPoint can register for pen button events to, for example, advance a slide show. Web PowerPoint should be able to do the same.

Is there any opposition to standardizing events such as "penbuttonclick", "penbuttondblclick", "penbuttonpressandhold" to enable such scenarios? Are there standards already being discussed that are applicable?

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