[w3c/uievents] Pen pendockchange event (#240)

Similar to [penbuttonevents](https://github.com/w3c/uievents/issues/237) this proposal is to expose new event called pendockchange event.

There is hardware e.g. Microsoft Surface Hub where it comes with a dock that is capable of emitting dock events. It is impossible today for a web app to detect pen dock change when user lifts the pen from the dock. Native apps however do get this functionality. With pendockchange event, developers can use this to change the app view. For example, PowerPoint app can change view tab to a drawing tab. Web PowerPoint should be able to do the same.

Is there any opposition to standardizing `pendockchange ` event to enable such scenarios? Are there standards already being discussed that are applicable?

[link](https://github.com/MicrosoftEdge/MSEdgeExplainers/blob/master/PenEvents/explainer.md) to the explainer.

@snianu as FYI

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