[whatwg/dom] Implementations do not match spec behavior for .adoptNode(attr) (Issue #1440)

Jamesernator created an issue (whatwg/dom#1440)

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

From following the [adopt a node](https://dom.spec.whatwg.org/#concept-node-adopt) logic, as far I can tell the only thing that should happen for `.adoptNode(attr)` is that `attr.ownerDocument` is changed. However in all implementations adopting the node also results in the attribute being removed from the element:

```ts
const el = document.createElement("div");
el.setAttribute("foo", "bar");

const doc = new Document();
doc.adoptNode(el.attributes[0]);

// Prints undefined in all browsers
console.log(el.getAttribute("foo"));
```

The implementation behavior makes more sense as it would be strange for an attr to have a different owner document to it's owner element, however this needs some steps in the spec, either by changing [adopt a node](https://dom.spec.whatwg.org/#concept-node-adopt) to check if node is an `Attr` or perhaps by defining [*adopting steps*](https://dom.spec.whatwg.org/#concept-node-adopt-ext) for `Attr`.

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