[FEATURE] Extended filter for product api

__Tasks:__

- [x] add functionality to filter products by it's categories 
- [ ] gather feedback for my changes

__Informations:__

| Q             | A
| ------------- | ---
| Tests pass?   | yes
| Fixed tickets | none
| BC Breaks     | none
| Doc           | none
one ore many categories? 

cause its get categories but the variable is named category