[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/idp/idp.go

@@ -2,6 +2,7 @@ package idp
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
 	"net/http"
 	"strings"
@@ -73,6 +74,23 @@ type UserData struct {
 	AppMetadata AppMetadata `json:"app_metadata"`
 }
 
+func (u *UserData) MarshalBinary() (data []byte, err error) {
+	return json.Marshal(u)
+}
+
+func (u *UserData) UnmarshalBinary(data []byte) (err error) {
+	return json.Unmarshal(data, &u)
+}
+
+func (u *UserData) Marshal() (data string, err error) {
+	d, err := json.Marshal(u)
+	return string(d), err
+}
+
+func (u *UserData) Unmarshal(data []byte) (err error) {
+	return json.Unmarshal(data, &u)
+}
+
 // AppMetadata user app metadata to associate with a profile
 type AppMetadata struct {
 	// WTAccountID is a NetBird (previously Wiretrustee) account id to update in the IDP