Refactor how message are sent to the queue

[devanbenz]

• Creation of a federation package
  • Includes event observers, listeners and producers to send messages to the queue
  • see: https://github.com/sublinks/sublinks-api/blob/main/src/main/java/com/sublinks/sublinksapi/person/events/LinkPersonCommunityCreatedEvent.java for examples of events within the person package