Interface CartChangeCustomLineItemQuantityAction

When multiple shipping addresses are set for a Custom Line Item, use the Add CustomLineItem update action to change the shipping details. Since it is not possible for the API to infer how the overall change in the Custom Line Item quantity should be distributed over the sub-quantities, the shippingDetails field is kept in its current state to avoid data loss.

To change the Custom Line Item quantity and shipping details together,
use this update action in combination with the [Set CustomLineItemShippingDetails](ctp:api:type:CartSetCustomLineItemShippingDetailsAction) update action
in a single Cart update command.
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