[WIP][FEATURE] implemented basic sidebar services for orders

__Tasks:__

- [ ] widget services
- [ ] test coverage
- [ ] gather feedback for my changes

__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | -
| Fixed tickets | -
| BC Breaks     | -
| Doc           | -

__Requires:__
- https://github.com/sulu-cmf/SuluAdminBundle/pull/164
- import of widget configuration in sulu-standard/complete