[whatwg/dom] MutationObserver attribute filter ignores attributes with a namespace (Issue #1364)

josepharhar created an issue (whatwg/dom#1364)

### What is the issue with the DOM Standard?

When the attributesFilter property is used for a MutationObserver, attributes with namespaces are unconditionally excluded from getting mutation records:

https://dom.spec.whatwg.org/#queueing-a-mutation-record

> type is "attributes", options["[attributeFilter](https://dom.spec.whatwg.org/#dom-mutationobserverinit-attributefilter)"] [exists](https://infra.spec.whatwg.org/#map-exists), and options["[attributeFilter](https://dom.spec.whatwg.org/#dom-mutationobserverinit-attributefilter)"] does not [contain](https://infra.spec.whatwg.org/#list-contain) name or namespace is non-null

I don't know any of the history here, but this capability was asked for here: https://issues.chromium.org/issues/392661412

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