Support for atomic operations

[maurei]

The task is to describe the atomic operations endpoint in the OAS and with that introduce all necessary types for modelling operation entries as OAS schemas.

At first glance it seems like a viable approach to generate for every resource a unique schema associated to every possible operation. Eg: AddBlogOperation, AddPersonOperation etc.

Things to consider:

• Local IDs
• Usages of ref, href
• Empty result objects