chore(PlayerScript/Hook) : Add CanSetTradeItem Hook in PlayerScript (#18583)

* chore(PlayerScript/Hook) : Add CanSetTradeItem Hook in PlayerScript

* Allowing non traded slots

* Fix typo and codestyle

src/server/game/Handlers/TradeHandler.cpp

@@ -708,6 +708,15 @@ void WorldSession::HandleSetTradeItemOpcode(WorldPacket& recvPacket)
         return;
     }
 
+    // PlayerScript Hook for checking traded items if we want to filter them in a custom module
+    if (!sScriptMgr->CanSetTradeItem(_player, item, tradeSlot))
+    {
+        // Do not send TRADE_STATUS_TRADE_CANCELED because it will cause double display of "Transaction canceled" notification
+        // On the trade initiator screen
+        SendTradeStatus(TRADE_STATUS_CLOSE_WINDOW);
+        return;
+    }
+
     my_trade->SetItem(TradeSlots(tradeSlot), item);
 }