Re: [whatwg/dom] Make it possible to observe connected-ness of a node (#533)

FrameMuse left a comment (whatwg/dom#533)

@justinfagnani Maybe I got you wrong, is this how it should work?
```js
const observer = new MutationObserver(entries => console.log(entries[0].connection))

const node = new Text("123")
observer.observe(node, { connection: true })

document.body.append(node) // => true
node.remove() // => false
```

Then I disagree. I personally think that connection is not mutation of a connected node (but a parent or document), it would be ambiguous to add it this way. The current `MutationObserver` is very on point - observe listed mutations **OF** these nodes. But in case of adding `connection` option, it goes a long way: observe mutations of all nodes, to tell if this is related to the observed node and see if it's connected or not.

So if it's already doing `childList` and `subtree` anyway, why making it ambiguous if we can introduce a new thing that just extends `MutationObserver`?

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