more work at performance

receiver/CMakeLists.txt

receiver/src/connection.cpp

receiver/src/request.cpp

receiver/src/request_handler.h

receiver/src/request_handler_file_write.cpp

receiver/src/request_handler_file_write.h

receiver/src/statistics.cpp

receiver/src/statistics.h

receiver/src/statistics_sender.h

receiver/src/statistics_sender_influx_db.cpp

receiver/src/statistics_sender_influx_db.h

receiver/unittests/mock_statistics.h

receiver/unittests/test_connection.cpp

receiver/unittests/test_request.cpp

receiver/unittests/test_request_handler_file_write.cpp

receiver/unittests/test_statistics.cpp