Export PRE/POST NAT in ClickHouse/Elastic and GUI

[lucaderi]

As of today, ntopng allows users to choose what IP (PRE/POST) NAT are used in the GUI.

Today we keep one or the other and had to choose "Use Post-Nat Destination IPv4 Addresses and Ports" or "Use Post-Nat Source IPv4 Addresses and Ports" to replace those values in ntopng preferences even if nProbe is sending over all of:

 --- [225][Len 4] %POST_NAT_SRC_IPV4_ADDR     %postNatSourceIPv4Address   Post Nat Source IPv4 Address
 --- [226][Len 4] %POST_NAT_DST_IPV4_ADDR     %postNatDestinationIPv4Address      Post Nat Destination IPv4 Address
 --- [227][Len 2] %POST_NAPT_SRC_TRANSPORT_PORT %postNaptSourceTransportPort      Post Napt Source Transport Port
 --- [228][Len 2] %POST_NAPT_DST_TRANSPORT_PORT %postNaptDestinationTransportPort Post Napt Destination Transport Port .

This ticket is to request to store both in ClickHouse and Elastic and perform searches on both PRE/POST fields

[MatteoBiscosi]

Info correctly exported and represented