[whatwg/dom] Proposal: ParentNode.wrap() (#479)

The **ParentNode.wrap()** method would replace a node with the parent node, appending the replaced node to the parent node.

### Syntax

```js
ParentNode.wrap(node);
```

### Rationale:

Like `childNode.remove()`, we’re de-complicating the process of wrapping a node, e.g.:

```js
if (node.parentNode) {
  node.parentNode.insertBefore(parentNode, node).appendChild(node);
}
```

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