code: public Builder addProcessors(Processor... processors) {
          this.processors.add(new ArrayList<>(Arrays.asList(processors)));
          return self();
      }
docs: Adds processors for populating a series of exchanges with an outgoing message - all processors in a single call
  apply ONLY to a single message, add consecutive calls to addProcessors in order to handle further messages
  
  @param processors A list of processors that will handle a separate exchange (in order)