[whatwg/dom] Proposal: getImageData api for all element，not limited to canvas (Issue #1317)

### What problem are you trying to solve?

I want to get DOM element rendered pixels for some advantage feature, just like a snapshot of a SPA "page (not the html document)". 
But there is no api to do this.

### What solutions exist today?

No solutions

### How would you solve it?

Canvas has a getImageData api to get rendered pixels, so is it possible to provide this interface to other elements to get DOM rendered pixels?

### Anything else?

_No response_

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