Added wrapper element around react editor loading/error/editor states
Added wrapper element around react editor loading/error/editor states

no issue

- has a default class of `koenig-react-editor` which can be added to by using `@className`
- adds classes of `koenig-react-editor-loading` and `koenig-react-editor-error` to the `<p>` elements rendered during loading or when loading fails

TryGhost/Ghost,TryGhost/Ghost,TryGhost/Ghost