Core/AreaTriggers: Add PlaySpellVisual

Port From (https://github.com/TrinityCore/TrinityCore/commit/6affa412b18b17623a828332823d0af55d664192)

Source/Game/Entities/AreaTrigger/AreaTrigger.cs

@@ -77,6 +77,14 @@ namespace Game.Entities
             }
         }
 
+        void PlaySpellVisual(uint spellVisualId)
+        {
+            AreaTriggerPlaySpellVisual packet = new();
+            packet.AreaTriggerGUID = GetGUID();
+            packet.SpellVisualID = spellVisualId;
+            SendMessageToSet(packet, false);
+        }
+
         bool Create(AreaTriggerId areaTriggerCreatePropertiesId, Map map, Position pos, int duration, AreaTriggerSpawn spawnData = null, Unit caster = null, Unit target = null, SpellCastVisual spellVisual = default, SpellInfo spellInfo = null, Spell spell = null, AuraEffect aurEff = null)
         {
             _targetGuid = target != null ? target.GetGUID() : ObjectGuid.Empty;

Source/Game/Networking/Packets/AreaTriggerPackets.cs

@@ -76,6 +76,20 @@ namespace Game.Networking.Packets
         public ObjectGuid TriggerGUID;
     }
 
+    class AreaTriggerPlaySpellVisual : ServerPacket
+    {
+        public ObjectGuid AreaTriggerGUID;
+        public uint SpellVisualID;
+
+        public AreaTriggerPlaySpellVisual() : base(ServerOpcodes.AreaTriggerPlaySpellVisual) { }
+
+        public override void Write()
+        {
+            _worldPacket.WritePackedGuid(AreaTriggerGUID);
+            _worldPacket.WriteUInt32(SpellVisualID);
+        }
+    }
+
     //Structs
     class AreaTriggerSplineInfo
     {