Get file list from Google Drive
        :param page_size:
        :param fields:
        :param order_by:
        :param query:
        :return:

def file_list(self, page_size: int, fields: str, order_by: str, query: str) -> dict:
        """
        Get file list from Google Drive
        :param page_size:
        :param fields:
        :param order_by:
        :param query:
        :return:
        """
        service = self.__get_service()
        results = service.files().list(
            pageSize=page_size,
            fields=fields,
            orderBy=order_by,
            q=query
        ).execute()
        return results.get('files', [])