Performance Improvements and Stability Enhancement - Dependency APIs

Desired Behavior

• improve performance of /inventory/dependencies API 
• enhance the stability of provided related objects from deeper levels of dependence
• provide information for related objects of deeper levels that keep the relation to its parent intact
• provide information about which objects have to be enforced for the subsequent deploy and release operation
  • the enforcement depends on
    • previous operations that changed the object - store, rename
    • exisitence of previous released/deployed versions of the references

Changes

• new Response
  • the new response should contain all related objects
    • requested items
    • all their direct references
    • and all related references from deeper levels
  • the objects in the response are
    • unique - no duplicates
    • identified by their ID - to be able to resolve references by their IDs and to prevent duplicated objects
      • objects are unique, referenced IDs can be present multiple times 
    • each holding its own direct references only and information about their enforcement from the POV of the parent object
• Performance
  • improve the recursive determination of dependencies
  • improve the storage of determined relations
  • reduce client sided enforcement processing
    • the determination of enforcement will be processed by the API and provides the information to the client
    • the client does not need to determine the enforcement on its own anymore
    • the client only needs to process the provided information