* update description of get_place_by_operation_name_and_input_port * create implementation for get_place_operation_name_and_output_port * fix typo * updatget_place_by_operation_name_and_input_port and get_place_by_operation_name_and_output_port * add tests for get_place_by_operation_name_and_input_port and get_place_by_operation_name_and_output_port * fix style