[WICG/webcomponents] [dom-parts] cloneWithParts / cloneTree (Issue #1012)

We need an API to clone parts with tree.

Current proposal:
https://github.com/WICG/webcomponents/blob/gh-pages/proposals/DOM-Parts.md#cloning-parts

```
partial interface Node {
    NodeWithParts cloneTree(optional CloneOptions options = {});
};

dictionary CloneOptions {
    boolean deep = true;
    Document? document;
    PartGroup? partGroup;
};

dictionary NodeWithParts {
    Node node;
    PartGroup? partGroup;
};
```

What happens to the current values of DOM parts? Do we allow DOM parts to have some non-initial values and do we clone those values as well? If so, what do we do with `PropertyPart` / `CustomPart`?

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