Core/Entities: Added GetStringId helper methods

Port From (https://github.com/TrinityCore/TrinityCore/commit/5cea37153eb6675bf0a25320a1c11cd0ec4969b6)

Source/Framework/Constants/SharedConst.cs

@@ -1024,6 +1024,13 @@ namespace Framework.Constants
         BelongsToLayer = 0x100000,
     }
 
+    public enum StringIdType
+    {
+        Template = 0,
+        Spawn = 1,
+        Script = 2
+    }
+
     // values based at Holidays.dbc
     public enum HolidayIds
     {

Source/Game/Entities/Creature/Creature.cs

@@ -2935,6 +2935,7 @@ namespace Game.Entities
         }
 
         public string[] GetStringIds() { return m_stringIds; }
+        public string GetStringId(StringIdType type) { return m_stringIds[(int)type]; }
 
         public VendorItemData GetVendorItems()
         {

Source/Game/Entities/GameObject/GameObject.cs

@@ -2685,6 +2685,7 @@ namespace Game.Entities
         }
 
         public string[] GetStringIds() { return m_stringIds; }
+        public string GetStringId(StringIdType type) { return m_stringIds[(int)type]; }
 
         public override string GetName(Locale locale = Locale.enUS)
         {