finished datasets for producer, added integration test

common/cpp/src/database/mongodb_client.cpp

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

producer/api/include/producer/common.h

producer/api/src/producer_impl.cpp

producer/api/src/request_handler_tcp.cpp

receiver/src/request_handler_db_write.cpp

receiver/src/requests_dispatcher.cpp

receiver/unittests/receiver_mocking.h

receiver/unittests/test_request_handler_db_writer.cpp

tests/automatic/producer_receiver/CMakeLists.txt

...omatic/producer_receiver/transfer_datasets/CMakeLists.txt

...omatic/producer_receiver/transfer_datasets/check_linux.sh

...tic/producer_receiver/transfer_datasets/check_windows.bat