Improvements for the KitchenOrderChanged Event

Plugin developers now have the ability to directly access ExternalData in the IKitchenOrder object when the KitchenOrderChanged event is triggered, which has now been renamed to GetKitchenOrderChanged.

If the previous notification behavior is required, it is sufficient to pass an optional flag false in the includeExternalData argument of the method.

Now developers can obtain data from IKitchenOrder.ExternalData immediately, without additional API calls. This improves performance by reducing the number of calls and simplifies working with ExternalData.