Re: [whatwg/dom] Allow custom "get the parent" algorithms for EventTargets (#583)

How about overloading the constructor of an `EventTarget` to allow assignment of a parentNode?

```webidl
[Exposed=*]
interface EventTarget {
  constructor(parent?: EventTarget);
}
```

If the `parent` is `undefined` or `null` then the `EventTarget` is considered to have no parent, otherwise assert that `parent` is `EventTarget`. For `Node`, `ShadowRoot` and `Document`, the `constructor` remains as-is and they continue to use their custom `get the parent` algos.

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