Re: [w3c/webcomponents] Expose shadowRoot on element internals (#871)

It seems awkward that all SSR aware components would have to write code like this:
```js
class CustomHTMLElement extends HTMLElement {
    #internals;

    constructor() {
        super();
        #internals = this.attachInternals();
        if (!#internals.shadowRoot)
            this.attachShadow({mode: 'closed'});
    }
}
```

With what I'm proposing (make attachShadow return the exiting declarative shadowRoot), we could something like this (obviously with a shorter name):

```js
class CustomHTMLElement extends HTMLElement {
    #shadowRoot;

    constructor() {
        super();
        #shadowRoot = this.attachShadow({mode: 'closed', returnExistingDeclarativeShadowRoot: true});
    }
}
```

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