[client,management] add netflow support to client and update management (#3414)

adds NetFlow functionality to track and log network traffic information between peers, with features including:

- Flow logging for TCP, UDP, and ICMP traffic
- Integration with connection tracking system
- Resource ID tracking in NetFlow events
- DNS and exit node collection configuration
- Flow API and Redis cache in management
- Memory-based flow storage implementation
- Kernel conntrack counters and userspace counters
- TCP state machine improvements for more accurate tracking
- Migration from net.IP to netip.Addr in the userspace firewall

management/server/route.go

@@ -388,6 +388,7 @@ func toProtocolRoutesFirewallRules(rules []*types.RouteFirewallRule) []*proto.Ro
 			Protocol:     getProtoProtocol(rule.Protocol),
 			PortInfo:     getProtoPortInfo(rule),
 			IsDynamic:    rule.IsDynamic,
+			PolicyID:     []byte(rule.PolicyID),
 		}
 	}