[whatwg/dom] feature: `element.getShadow(opts)` (Issue #1046)

This would be an alternative to `element.attachShadow(opts)`. It would be more like `getContext` in that if a root is not already created and attached, it will create and attached it before returning it. If it is already created, the existing root will be returned. This would make it easier to write code like this:

```js
class MyEl extends HTMLElement {
  connectedCallback() {
    this.getShadow(opts).innerHTML = `...`
  }
}
```

without having to write extra code to handle whether or not a root already exists.

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