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Merge pull request #178 from ckeditor/i/118

Feature: The `<CKEditor>` component contains the built-in [watchdog](https://ckeditor.com/docs/ckeditor5/latest/features/watchdog.html) feature. Closes #118. 

Feature: Introduced the `<CKEditorContext>` component that supports the [context](https://ckeditor.com/docs/ckeditor5/latest/features/collaboration/context-and-collaboration-features.html) feature.

Feature: Added the `id` property which is used to distinguish different documents. When this property changes, the component restarts the underlying editor instead of setting data on it, which allows e.g. for switching between collaboration documents and fixes a couple of issues (e.g. the `onChange` event no longer fires during changing the document). Closes #168. Closes #169.

Feature: The `onError()` callback will be called with two arguments. The first one will be an error object (as it was before the release 3+). A second argument is an object that contains two properties:

  * `{String} phase`: `'initialization'|'runtime'` - Informs when the error has occurred (during the editor/context initialization or after the initialization).
  * `{Boolean} willEditorRestart` - When `true`, it means that the editor component will restart itself.
  * `{Boolean} willContextRestart`- When `true`, it means that the context component will restart itself.

    The `willEditorRestart` property will not appear when the error has occurred in the context feature. 
    The `willContextRestart` property will not appear when the error has occurred in the editor.

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* _Add to the release summary:_ Both components (`<CKEditor>` and `<CKEditorContext>`) will internally use the [`Watchdog`](https://ckeditor.com/docs/ckeditor5/latest/api/module_watchdog_watchdog-Watchdog.html) class that restarts the [editor](https://ckeditor.com/docs/ckeditor5/latest/api/module_watchdog_editorwatchdog-EditorWatchdog.html) or [context](https://ckeditor.com/docs/ckeditor5/lates... (continued)

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