[whatwg/dom] Add `valid` event for form fields (#728)

We already have an `invalid` event for form fields, but no `valid` event. (In contrast, in CSS, we have **both** an `:invalid` and a `:valid` pseudo-class, which is very helpful.) Can we add a `valid` event for form fields?

Use case: I have a warning paragraph that shows when a field is invalid, which is easy to trigger with the `invalid` event. However, it's much harder to hide the paragraph when the field becomes valid again.

It seems like this idea must have come up before, though I couldn't find anything about it.

(Note: I already posted this issue here -- https://github.com/w3c/html/issues/1665 -- but now I'm wondering if this is the better place? Sorry for any confusion!)

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