Change App2mzs Interface and Init Delivery Pipeline

- Change app2mzs interface: output message from
  app2mzs:DeliveryRequest was app2mzs:DeliveryResponse, now its
  msg:DeliveryRequestStatus. Reason: ZD returns
  msg:DeliveryRequestStatus which is signed. Moazs does not convert
  msg:DeliveryRequestStatus into app2mzs:DeliveryResponse because the
  conversion woudl break the signature.
- App2MzsService: Make beans final and inject them with constructor;
  Refactor DeliveryRequestHandler into App2MZSService.
- DeliveryPipeline: Add Interface and a "SameThreadImplementation"
  that executes the pipeline in the same threat and can be used in
  single mode.
- DeliveryRepository: Augment interface for storing and retrieving
  request status objects; Add in-memory-implementation for status objects.
- Utils: Add helper function for coalescing multiple values

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