[whatwg/dom] Proposal: getCornerPoints() (Issue #1294)

### What problem are you trying to solve?

For a designer application you need the 4 corner points of a element to draw overlays.

### What solutions exist today?

You only could use the getBoundClientRect API, or combine all transformations and positionings and calculate the real element position manually

### How would you solve it?

Add an API to Element (getCornerPoints) wich returns an array of 4 points wich are the transformed points according to window.

### Anything else?

sample what I need: https://node-projects.github.io/web-component-designer-demo/index.html?html=%3Cbutton%20style=%22width:80px;height:30px;position:absolute;left:175px;top:107px;transform:rotate(-45deg);%22%3EButton%3C/button%3E
(click on the button to see the overlay)
This works now, but is slow and error prone. And it does not work correctly for transformed SVG element parts.

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