[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

client/internal/netflow/logger/logger_test.go

@@ -0,0 +1,68 @@
+package logger_test
+
+import (
+	"context"
+	"net"
+	"testing"
+	"time"
+
+	"github.com/google/uuid"
+
+	"github.com/netbirdio/netbird/client/internal/netflow/logger"
+	"github.com/netbirdio/netbird/client/internal/netflow/types"
+)
+
+func TestStore(t *testing.T) {
+	logger := logger.New(context.Background(), nil, net.IPNet{})
+	logger.Enable()
+
+	event := types.EventFields{
+		FlowID:    uuid.New(),
+		Type:      types.TypeStart,
+		Direction: types.Ingress,
+		Protocol:  6,
+	}
+
+	wait := func() { time.Sleep(time.Millisecond) }
+	wait()
+	logger.StoreEvent(event)
+	wait()
+
+	allEvents := logger.GetEvents()
+	matched := false
+	for _, e := range allEvents {
+		if e.EventFields.FlowID == event.FlowID {
+			matched = true
+		}
+	}
+	if !matched {
+		t.Errorf("didn't match any event")
+	}
+
+	// test disable
+	logger.Disable()
+	wait()
+	logger.StoreEvent(event)
+	wait()
+	allEvents = logger.GetEvents()
+	if len(allEvents) != 0 {
+		t.Errorf("expected 0 events, got %d", len(allEvents))
+	}
+
+	// test re-enable
+	logger.Enable()
+	wait()
+	logger.StoreEvent(event)
+	wait()
+
+	allEvents = logger.GetEvents()
+	matched = false
+	for _, e := range allEvents {
+		if e.EventFields.FlowID == event.FlowID {
+			matched = true
+		}
+	}
+	if !matched {
+		t.Errorf("didn't match any event")
+	}
+}