Re: [WICG/webcomponents] Need a callback for when children changed or parser finished parsing children (#809)

An attempt at a concrete API for a Promise could be one in `elementinternals`:

```js
class MyElement extends HTMLElement {
  #internals = this.attachInternals()
  async connectedCallback() {
    await this.#internals.fullyParsed();
  }
}
```

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