replaced sequential IDs with xids (random, uuid-like)

Signed-off-by: Dmitri Dolguikh <dmitri.external@netbird.io>

dns/nameserver.go

@@ -53,9 +53,7 @@ type NameServerGroup struct {
 	ID string `gorm:"primaryKey"`
 	// AccountID is a reference to Account that this object belongs
 	AccountID string `gorm:"index"`
-	// AccountSeqID is a per-account monotonically increasing identifier used as the
-	// compact wire id when sending NetworkMap components to capable peers.
-	AccountSeqID int32 `json:"-" gorm:"not null;default:0"`
+	PublicID  string `json:"-"`
 	// Name group name
 	Name string
 	// Description group description