[whatwg/dom] Proposal: ParentNode.empty() (#478)

The **ParentNode.empty()** method would remove all child nodes from the parent node.

### Syntax

```js
ParentNode.empty();
```

### Rationale:

Like `append()`, `prepend()`, `before()`, `after()`, and `replaceWith()`, we’re allowing developers to do something useful without a loop, e.g:

```js
while (parentNode.lastChild) {
  parentNode.removeChild(parentNode.lastChild);
}
```

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