Update to use CmfMedia Image

- after this PR an elfinder PR can be created based on this

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | yes
| Deprecations? | no
| Tests pass?   | na
| Fixed tickets | na
| License       | MIT
| Doc PR        | https://github.com/symfony-cmf/symfony-cmf-docs/pull/191

**TODO to merge:**
- [x] move security checks to ``Symfony\Cmf\Bundle\MediaBundle\Controller\FileController``
- [x] change back image config: enabled, image_class and image_controller
- [x] only inject id image support is enabled for JsLoaderController
- [x] change ``getImagesByName`` usage in ImageController to ``searchImages``
- [x] change ``cmf_media.upload_file_helper`` to ``cmf_media.upload_image_helper``