Suricata

Jason shared the pcap attached to this issue, which highlighted that sometimes the pgsql parser
will either not see or at least not log (probably not see) some messages that it should be able to recognize and parse.

From a brief analysis of this capture, I've identified at least two:
- for pgsql.tx_id: 45 there is no request being logged. To understand if it's logged as another transaction, or skipped altogether.
-- related to the above: 54 Simple query requests are sent. Check how many we log.
- there are 5 NoticeResponse messages in that capture. None are logged. I'll create a separate issue to track this.
- the one existing NotificationResponse is also skipped

To investigate and see what more is missed.