Refactored dummy data producer

common/cpp/include/common/networking.h

...ples/producer/dummy-data-producer/dummy_data_producer.cpp

producer/api/include/producer/producer.h

producer/api/src/producer_impl.cpp

producer/api/unittests/test_producer_impl.cpp

receiver/src/network_producer_peer.cpp

receiver/src/network_producer_peer_handlers.cpp