start adding streams to producer/workers

authorizer/src/asapo_authorizer/server/authorize.go

authorizer/src/asapo_authorizer/server/authorize_test.go

authorizer/src/asapo_authorizer/server/server.go

common/cpp/include/common/data_structs.h

common/cpp/src/data_structs/data_structs.cpp

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

examples/worker/getnext_broker/getnext_broker.cpp

producer/api/CMakeLists.txt

producer/api/include/producer/producer.h

producer/api/include/producer/producer_error.h

producer/api/src/producer.cpp

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/unittests/test_producer.cpp

producer/api/unittests/test_producer_impl.cpp

producer/api/unittests/test_producer_request.cpp

producer/event_monitor_producer/src/main_eventmon.cpp