[FEATURE] Implemented content query

Content Query used to build queries for loading small content pieces.

__Tasks:__

- [ ] test coverage (Issue: ...)
- [ ] gather feedback for my changes
- [ ] submit changes to the documentation (Issue: ...)


__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | yes
| Fixed tickets | none
| BC Breaks     | none
| Doc           | TODO