feat(Core/Scripting): Implement AfterInstanceGameObjectCreate() global hook (#17935)

src/server/game/Scripting/ScriptDefines/GlobalScript.cpp

@@ -232,6 +232,20 @@ void ScriptMgr::OnBeforeSetBossState(uint32 id, EncounterState newState, Encount
     });
 }
 
+/**
+ * @brief Called when a game object is created inside an instance
+ *
+ * @param instance A pointer to the [map] object of the instance
+ * @param go The object being added
+ */
+void ScriptMgr::AfterInstanceGameObjectCreate(Map* instance, GameObject* go)
+{
+    ExecuteScript<GlobalScript>([&](GlobalScript* script)
+    {
+        script->AfterInstanceGameObjectCreate(instance, go);
+    });
+}
+
 GlobalScript::GlobalScript(const char* name)
     : ScriptObject(name)
 {

src/server/game/Scripting/ScriptDefines/GlobalScript.h

@@ -72,6 +72,9 @@ public:
 
     // Called when any raid boss has their state updated (e.g. pull, reset, kill)
     virtual void OnBeforeSetBossState(uint32 /*id*/, EncounterState /*newState*/, EncounterState /*oldState*/, Map* /*instance*/) { }
+
+    // Called when a gameobject is created by an instance
+    virtual void AfterInstanceGameObjectCreate(Map* /*instance*/, GameObject* /*go*/) { }
 };
 
 #endif