<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def store_extra_info(self, key: str, value: Any) -> None: """ Store some extra value in the messaging storage. :param key: key of dictionary entry to add. :param value: value of dictionary entry to add. :returns: None """

        self.extra_keys[key] = value