start working on new api

common/cpp/src/json_parser/rapid_json.cpp

common/cpp/unittests/json_parser/test_json_parser.cpp

worker/api/cpp/include/worker/data_broker.h

worker/api/cpp/src/folder_data_broker.cpp

worker/api/cpp/src/folder_data_broker.h

worker/api/cpp/src/server_data_broker.cpp

worker/api/cpp/src/server_data_broker.h

worker/api/cpp/unittests/test_folder_broker.cpp

worker/api/cpp/unittests/test_server_broker.cpp