[WICG/webcomponents] `CustomElementRegistry.define()` should return the new custom element (#927)

If calling `customElements.get()` returns `undefined`, and if we want to immediately set the custom element afterward, we would have to do something like:

```js
    let registeredElement = customElements.get(element);
    if (!registeredElement) {
      customElementRegistry.define("text-element", Text, { extends: "p" });
      registeredElement = customElements.get(element);
    }

```

If `CustomElementRegistry.define()` returned the defined element, we could instead do:

```js
    let registeredElement = customElements.get(element);
    if (!registeredElement) registeredElement = customElementRegistry.define("text-element", Text, { extends: "p" });
```

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