added tests for reciever and io

3d_party/rapidjson/include/rapidjson/reader.h

common/cpp/include/common/error.h

common/cpp/include/system_wrappers/io.h

common/cpp/src/system_io/system_io_windows.cpp

receiver/src/receiver_error.h

receiver/src/request_handler_file_write.cpp

receiver/unittests/test_request.cpp

receiver/unittests/test_request_handler_file_write.cpp

tests/system_io/CMakeLists.txt

tests/system_io/write_data_to_file/CMakeLists.txt

tests/system_io/write_data_to_file/cleanup_linux.sh

tests/system_io/write_data_to_file/cleanup_windows.bat

tests/system_io/write_data_to_file/setup_linux.sh

tests/system_io/write_data_to_file/setup_windows.bat

tests/system_io/write_data_to_file/write_data_to_file.cpp