Return parsed args from parser, adding options for train data inputs

def parse_args(parser: ArgumentParser) -> Any:
        """Return parsed args from parser, adding options for train data inputs"""
        extra_usage = '''
            :folder str
                Folder to load wav files from
            
            :-tf --tags-folder str {folder}
                Specify a different folder to load file ids
                in tags file from
            
            :-tg --tags-file str -
                Text file to load tags from where each line is
                <file_id> TAB (wake-word|not-wake-word) and
                {folder}/<file_id>.wav exists
            
        '''
        add_to_parser(parser, extra_usage)
        args = parser.parse_args()
        args.tags_folder = args.tags_folder.format(folder=args.folder)
        return args