[whatwg/dom] Consider adding localNameFilter to MutationObserver (#398)

I was looking at a slow (cross) browser addon code, and one thing they need to do is to figure out when new input elements have been added to the tree.
This means that all the added (and removed) elements are touched, which forces browsers to have
JS wrappers for those and create MutationRecords too.

localNamefilter, similar to attributeFilter would optimize some of that out.
Using css for filtering might be also one option, but it is way more heavy weight in general, so if possible, I'd stick with localNames. (and localNameFilter could be used for text node filtering too, unlike css)

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