change FileData from vector to unique_ptr

common/cpp/include/common/file_info.h

common/cpp/include/system_wrappers/system_io.h

common/cpp/src/system_io.cpp

common/cpp/src/system_io_linux.cpp

examples/worker/process_folder/process_folder.cpp

tests/system_io/read_file_content/read_file_content.cpp

tests/system_io/read_files_in_folder/read_folder_content.cpp

tests/system_io/read_files_in_folder/setup.sh

tests/worker/connect_multithread/content_multithread.cpp

tests/worker/next_multithread/next_multithread.cpp

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

worker/api/cpp/src/folder_data_broker.h

worker/api/cpp/unittests/test_folder_broker.cpp