[FEATURE] extension adaptions for media bundle

adapted sulu-extension because of the upload ui of medias

__Tasks:__

- [x] finish the code
- [x] gather feedback for my changes

__Informations:__

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| Tests pass?   | none
| Fixed tickets | none
| Doc           | none