Re: [whatwg/dom] Use Infra to define mutation observers (#609)

So, we could give each "registered observer" a "transient registered observer node list". When removing a node, in step 16 of https://whatpr.org/dom/609.html#concept-node-remove, aside from appending a new transient registered observer to _node_'s  registered observer list, we also append _node_ to _registered_'s transient registered observer node list.

Then we could rewrite step 7 of https://whatpr.org/dom/609.html#dom-mutationobserver-observe to use this new node list on _registered_ to remove the transient registered observers from those nodes.

However, we also remove transient registered observers in https://whatpr.org/dom/609.html#notify-mutation-observers based on the observer field. Should `MutationObserver` (the value of that observer field) also keep a list of nodes that have transient registered observers?

@ajklein if you could help with this further formalizing of mutation observers that'd be appreciated. If it's too much to page in I can relate.

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