[whatwg/dom] Dispatching slotchange within a compound microtask (#734)

HTML requires that "execute a compound microtask subtask" is used to invoke callbacks within a "compound microtask", as I understand it. However, we don't do this for the slotchange event. And it's not clear to me that we can, since dispatching the slotchange event can result in multiple listeners being triggered, each with their own callback. Surely we don't want to weave "execute a compound microtask subtask" through all that?

So how do browsers implement the last step of https://dom.spec.whatwg.org/#notify-mutation-observers today?

cc @whatwg/components 

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