feat: Spawn objects in clients in same order as server (#247)

If I spawn 10 objects in the server,  when a client connect
they should be spawned in the client in the same order.

Co-authored-by: Paul Pacheco <paul.pacheco@aa.com>

Assets/Mirror/Runtime/NetworkServer.cs

@@ -1078,6 +1078,14 @@ internal bool ValidateSceneObject(NetworkIdentity identity)
             return identity.sceneId != 0;
         }
 
+        private class NetworkIdentityComparer : IComparer<NetworkIdentity>
+        {
+            public int Compare(NetworkIdentity x, NetworkIdentity y)
+            {
+                return x.NetId.CompareTo(y.NetId);
+            }
+        }
+
         /// <summary>
         /// This causes NetworkIdentity objects in a scene to be spawned on a server.
         /// <para>NetworkIdentity objects in a scene are disabled by default. Calling SpawnObjects() causes these scene objects to be enabled and spawned. It is like calling NetworkServer.Spawn() for each of them.</para>
@@ -1091,6 +1099,8 @@ public bool SpawnObjects()
                 return false;
 
             NetworkIdentity[] identities = Resources.FindObjectsOfTypeAll<NetworkIdentity>();
+            Array.Sort(identities, new NetworkIdentityComparer());
+
             foreach (NetworkIdentity identity in identities)
             {
                 if (ValidateSceneObject(identity))