feat(Core/Entities): add OnPlayerCanGiveLevel script hook (#21666)

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

@@ -208,6 +208,7 @@ enum PlayerHook
     PLAYERHOOK_ON_BEFORE_UPDATE_SKILL,
     PLAYERHOOK_ON_UPDATE_SKILL,
     PLAYERHOOK_CAN_RESURRECT,
+    PLAYERHOOK_ON_CAN_GIVE_LEVEL,
     PLAYERHOOK_END
 };
 
@@ -782,6 +783,16 @@ public:
      * @return true if player is authorized to resurect
      */
     virtual bool OnPlayerCanResurrect(Player* /*player*/) { return true; }
+
+    /**
+     * @brief This hook is called, to cancel the normal level up flow
+     *
+     * @param player Contains information about the Player
+     * @param newLevel The new level the player is about to be given
+     *
+     * @return true if player is allowed to gain the new level
+     */
+    virtual bool OnPlayerCanGiveLevel(Player* /*player*/, uint8 /*newLevel*/) { return true; }
 };
 
 #endif