update to use broker with mulithreading

examples/worker/getnext_broker/check_linux.sh

examples/worker/getnext_broker/check_windows.bat

examples/worker/getnext_broker/getnext_broker.cpp

tests/worker/folder_to_db/check_linux.sh

tests/worker/folder_to_db/check_windows.bat

tests/worker/next_multithread_folder/CMakeLists.txt

worker/api/cpp/src/curl_http_client.cpp

worker/api/cpp/src/curl_http_client.h

worker/api/cpp/src/http_client.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/tools/folder_to_db/src/folder_db_importer.cpp

worker/tools/folder_to_db/src/folder_db_importer.h

worker/tools/folder_to_db/src/main.cpp

worker/tools/folder_to_db/unittests/test_folder_to_db.cpp