Core/Movement: Implement move time skipped handler

Port From (https://github.com/TrinityCore/TrinityCore/commit/4507a02ada7ff2b30d1e82d4a111fc7143fd0823)

Source/Game/Handlers/MovementHandler.cs

@@ -694,6 +694,26 @@ namespace Game
         [WorldPacketHandler(ClientOpcodes.MoveTimeSkipped, Processing = PacketProcessing.Inplace)]
         void HandleMoveTimeSkipped(MoveTimeSkipped moveTimeSkipped)
         {
+            Unit mover = GetPlayer().m_unitMovedByMe;
+            if (mover == null)
+            {
+                Log.outWarn(LogFilter.Player, $"WorldSession.HandleMoveTimeSkipped wrong mover state from the unit moved by {GetPlayer().GetGUID()}");
+                return;
+            }
+
+            // prevent tampered movement data
+            if (moveTimeSkipped.MoverGUID != mover.GetGUID())
+            {
+                Log.outWarn(LogFilter.Player, $"WorldSession.HandleMoveTimeSkipped wrong guid from the unit moved by {GetPlayer().GetGUID()}");
+                return;
+            }
+
+            mover.m_movementInfo.Time += moveTimeSkipped.TimeSkipped;
+
+            MoveSkipTime moveSkipTime = new();
+            moveSkipTime.MoverGUID = moveTimeSkipped.MoverGUID;
+            moveSkipTime.TimeSkipped = moveTimeSkipped.TimeSkipped;
+            mover.SendMessageToSet(moveSkipTime, _player);
         }
 
         [WorldPacketHandler(ClientOpcodes.MoveSplineDone, Processing = PacketProcessing.ThreadSafe)]

Source/Game/Networking/Packets/MovementPackets.cs

@@ -982,6 +982,20 @@ namespace Game.Networking.Packets
         public uint TimeSkipped;
     }
 
+    class MoveSkipTime : ServerPacket
+    {
+        public MoveSkipTime() : base(ServerOpcodes.MoveSkipTime, ConnectionType.Instance) { }
+
+        public override void Write()
+        {
+            _worldPacket.WritePackedGuid(MoverGUID);
+            _worldPacket.WriteUInt32(TimeSkipped);
+        }
+
+        public ObjectGuid MoverGUID;
+        public uint TimeSkipped;
+    }
+    
     class SummonResponse : ClientPacket
     {
         public SummonResponse(WorldPacket packet) : base(packet) { }