File Process API

def get_dir_files_as_list(dir_path: str = getcwd(), default_search_file_extension: str = ".json") -> List[str]:
    """
    get dir file when end with default_search_file_extension
    :param dir_path: which dir we want to walk and get file list
    :param default_search_file_extension: which extension we want to search
    :return: [] if nothing searched or [file1, file2.... files] file was searched
    """