Add multiple ``user_ids`` for the given ``address``.

        Implicitly adds any addresses if they were unknown before.

def add_userids_for_address(self, address: Address, user_ids: Iterable[str]):
        """ Add multiple ``user_ids`` for the given ``address``.

        Implicitly adds any addresses if they were unknown before.
        """
        self._address_to_userids[address].update(user_ids)