Process `limit` number of messages from the clientInBox.

        :param limit: the maximum number of messages to process
        :return: the number of messages successfully processed

async def serviceClientMsgs(self, limit: int) -> int:
        """
        Process `limit` number of messages from the clientInBox.

        :param limit: the maximum number of messages to process
        :return: the number of messages successfully processed
        """
        c = await self.clientstack.service(limit, self.quota_control.client_quota)
        self.metrics.add_event(MetricsName.CLIENT_STACK_MESSAGES_PROCESSED, c)

        await self.processClientInBox()
        return c