Follow-up orders for kitchen orders

In Api V8Preview6 for kitchen orders, the ability to create follow-up orders for kitchen orders has been added.

The formation of a kitchen follow-up order occurs after the creation of the corresponding `follow-up order for a closed order at the waiter station. That is, if an follow-up order is created at the waiter station, then when it is printed, the created kitchen order will also be an follow-up order for the kitchen order, for the waiter part of which the follow-up order was made.

For this purpose to the IKitchenOrder a field has been added GroupKitchenOrderId, which has the id of the kitchen order for which this order is an follow-up order.

Alternatively, you can mark an order as a follow-up order using the operation MarkOrderAsAdditional. Existing kitchen orders will receive the same connection as their waiter parts.