Better export of the `Ckeditor` component

[filipsobol]

Currently this integration exposes two things:

• Vue.js plugin that register the global Ckeditor component.
• The Ckeditor component itself.

The plugin can be easily imported using the default export like so:

import Plugin from '@ckeditor/ckeditor5-vue';

However, the component itself is only available as the key of the default object:

import Plugin from '@ckeditor/ckeditor5-vue';

const Ckeditor = Plugin.component

This integration should have a better export for this component. Example:

import Plugin, { Ckeditor } from '@ckeditor/ckeditor5-vue';

// `Plugin` is the Vue.js plugin
// `Ckeditor` is Vue component