feat(Scripting/Hooks): Implement OnGameEventCheck() hook (#10761)

src/server/game/Events/GameEventMgr.cpp

@@ -1136,6 +1136,9 @@ uint32 GameEventMgr::Update()                               // return the next e
         // must do the activating first, and after that the deactivating
         // so first queue it
         //LOG_ERROR("sql.sql", "Checking event {}", itr);
+
+        sScriptMgr->OnGameEventCheck(itr);
+
         if (CheckOneGameEvent(itr))
         {
             // if the world event is in NEXTPHASE state, and the time has passed to finish this event, then do so

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

@@ -33,3 +33,11 @@ void ScriptMgr::OnGameEventStop(uint16 EventID)
         script->OnStop(EventID);
     });
 }
+
+void ScriptMgr::OnGameEventCheck(uint16 EventID)
+{
+    ExecuteScript<GameEventScript>([&](GameEventScript* script)
+    {
+        script->OnEventCheck(EventID);
+    });
+}

src/server/game/Scripting/ScriptMgr.h

@@ -1717,6 +1717,9 @@ public:
 
     // Runs on stop event
     virtual void OnStop(uint16 /*EventID*/) { }
+
+    // Runs on event check
+    virtual void OnEventCheck(uint16 /*EventID*/) { }
 };
 
 class MailScript : public ScriptObject
@@ -2437,6 +2440,7 @@ public: /* SpellSC */
 public: /* GameEventScript */
     void OnGameEventStart(uint16 EventID);
     void OnGameEventStop(uint16 EventID);
+    void OnGameEventCheck(uint16 EventID);
 
 public: /* MailScript */
     void OnBeforeMailDraftSendMailTo(MailDraft* mailDraft, MailReceiver const& receiver, MailSender const& sender, MailCheckMask& checked, uint32& deliver_delay, uint32& custom_expiration, bool& deleteMailItemsFromDB, bool& sendMail);