Core/Creature: Added possibility to give creatures multiple gossip menu ids and control them via conditions

Port From (https://github.com/TrinityCore/TrinityCore/commit/36044a9470e9c39a71916e908ab6cf4f95677793)

Source/Game/Entities/Creature/Creature.Fields.cs

@@ -28,7 +28,7 @@ namespace Game.Entities
 
         bool _isMissingCanSwimFlagOutOfCombat;
 
-        uint? _gossipMenuId;
+        uint _gossipMenuId;
         uint? _trainerId;
 
         public ulong m_PlayerDamageReq;

Source/Game/Entities/Creature/Creature.cs

@@ -1140,13 +1140,10 @@ namespace Game.Entities
 
         public uint GetGossipMenuId()
         {
-            if (_gossipMenuId.HasValue)
-                return _gossipMenuId.Value;
-
-            return GetCreatureTemplate().GossipMenuId;
+            return _gossipMenuId;
         }
 
-        public void SetGossipMenuId(uint? gossipMenuId)
+        public void SetGossipMenuId(uint gossipMenuId)
         {
             _gossipMenuId = gossipMenuId;
         }

Source/Game/Entities/Creature/CreatureData.cs

@@ -21,7 +21,7 @@ namespace Game.Entities
         public string SubName;
         public string TitleAlt;
         public string IconName;
-        public uint GossipMenuId;
+        public List<uint> GossipMenuIds = new();
         public Dictionary<Difficulty, CreatureLevelScaling> scalingStorage = new();
         public int HealthScalingExpansion;
         public uint RequiredExpansion;