add verbose info for Message.preview()

        """Move file `file_src` to `file_dist`."""

        shutil.copy(file_src, file_dst)

    def copy_to_output(self, file_paths: list):

        for file_path in file_paths:

            pass

    def call(self, func: Callable, *args: Any, **kwargs: Any):

        self.pipeline_logger.info(

            f"====================================================="

    def preview(self, dlist: list[dict], n: int = 10) -> None:

        """Preview top `n` messages."""

        print(f"No. of messages = {len(dlist)}")

        print(f"=========== Top {n} ===========")

        s = ""

        for d in dlist[:n]:

            s += self.dict2msg(d) + "\n"

        print(s)

        print("")

    @staticmethod

    def dict2msg(d: dict):