**What**
Create a service abstraction for the modules internal service layer. The objective is to reduce the effort of building new modules when the logic is the same or otherwise allow to override the default behavior.
Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>
Duplicate of #6008, but I messed up my git history big time :'(
**What**
- CartService and CartRepository + tests
- AddressService and AddressRepository + tests
- CartModuleService skeleton. Full implementation + tests will be added in a separate PR