Refactor: added ping messages for auto peering and refactored code

packages/timeutil/ticker.go

plugins/autopeering/parameters/parameters.go

plugins/autopeering/peermanager/accepted_neighbors.go

...ins/autopeering/peermanager/chosen_neighbor_candidates.go

plugins/autopeering/peermanager/chosen_neighbors.go

plugins/autopeering/peermanager/constants.go

plugins/autopeering/peermanager/entry_nodes.go

plugins/autopeering/peermanager/events.go

plugins/autopeering/peermanager/known_peers.go

plugins/autopeering/peermanager/neighborhood.go

plugins/autopeering/peermanager/peer_manager.go

plugins/autopeering/peermanager/types/peer_list.go

plugins/autopeering/peermanager/types/peer_register.go

plugins/autopeering/plugin.go

plugins/autopeering/protocol/chosen_neighbor_processor.go

plugins/autopeering/protocol/constants/constants.go

plugins/autopeering/protocol/error_handler.go

plugins/autopeering/protocol/events.go

plugins/autopeering/protocol/incoming_ping_processor.go

plugins/autopeering/protocol/incoming_request_processor.go