[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/status/error.go

@@ -40,6 +40,8 @@ const (
 // Type is a type of the Error
 type Type int32
 
+var ErrExtraSettingsNotFound = fmt.Errorf("extra settings not found")
+
 // Error is an internal error
 type Error struct {
 	ErrorType Type
@@ -206,3 +208,7 @@ func NewOwnerDeletePermissionError() error {
 func NewPATNotFoundError(patID string) error {
 	return Errorf(NotFound, "PAT: %s not found", patID)
 }
+
+func NewExtraSettingsNotFoundError() error {
+	return ErrExtraSettingsNotFound
+}