New player event: PLAYER_EVENT_ON_PET_ADDED_TO_WORLD (#3)

Co-authored-by: UltraNix <ultranix@gmail.com>

GlobalMethods.h

@@ -362,10 +362,10 @@ namespace LuaGlobalFunctions
      * Low GUID is an ID to distinct the objects of the same type.
      *
      * [Player] and [Creature] for example can have the same low GUID but not GUID.
-     * 
+     *
      * On TrinityCore all low GUIDs are different for all objects of the same type.
      * For example creatures in instances are assigned new GUIDs when the Map is created.
-     * 
+     *
      * On MaNGOS and cMaNGOS low GUIDs are unique only on the same map.
      * For example creatures in instances use the same low GUID assigned for that spawn in the database.
      * This is why to identify a creature you have to know the instanceId and low GUID. See [Map:GetIntstanceId]
@@ -700,6 +700,7 @@ namespace LuaGlobalFunctions
      *     // UNUSED                               =     40,       // (event, player)
      *     // UNUSED                               =     41,       // (event, player)
      *     PLAYER_EVENT_ON_COMMAND                 =     42,       // (event, player, command) - player is nil if command used from console. Can return false
+     *     PLAYER_EVENT_ON_PET_ADDED_TO_WORLD      =     43,       // (event, player, pet)
      * };
      * </pre>
      *
@@ -2273,7 +2274,7 @@ namespace LuaGlobalFunctions
 
     /**
      * Adds a taxi path to a specified map, returns the used pathId.
-     * 
+     *
      * Note that the first taxi point needs to be near the player when he starts the taxi path.
      * The function should also be used only **once** per path added so use it on server startup for example.
      *