producer sends image metadata

common/cpp/include/common/networking.h

common/cpp/unittests/request/test_request.cpp

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

producer/api/include/producer/producer.h

producer/api/src/producer_impl.cpp

producer/api/src/producer_impl.h

producer/api/src/producer_request.cpp

producer/api/src/producer_request.h

producer/api/src/request_handler_tcp.cpp

producer/api/src/request_handler_tcp.h

producer/api/unittests/test_producer.cpp

producer/api/unittests/test_producer_impl.cpp

producer/api/unittests/test_producer_request.cpp

producer/api/unittests/test_request_handler_filesystem.cpp

producer/api/unittests/test_request_handler_tcp.cpp

...r/unittests/receiver_data_server/test_request_handler.cpp

receiver/unittests/test_connection.cpp