⚛️ Directives don't work if they are used inside of a component

Because we're extracting the `wp-` attributes only on the server-side rendered HTML, if a component contains a directive, it won't work:

```js
const View = ({ ... }) => (
  <div {...}>
    <span wp-some-directive>...</span>
  </div>
);
```

I think we need to move everything to `options.vnode`. I'll open a PR to investigate.