[whatwg/dom] Add new mutation observer init options elementHasAttributeNameFilter and elementLocalNameFilter (#885)

Adds additional options when constructing a `MutationObserver`.

MutationObserverInit now contains two additional options: `elementHasAttributeNameFilter` and `elementLocalNameFilter` which are used to enhance the precision of filtering DOM nodes to observe.

See #398 for the background.

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(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/885


-- Commit Summary --

  * initial changes
  * remove new lines
  * address some pr comments
  * fix method to get attribute names

-- File Changes --

    M dom.bs (83)

-- Patch Links --

https://github.com/whatwg/dom/pull/885.patch

https://github.com/whatwg/dom/pull/885.diff


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