Added 'Canceled' ShipmentState to Orders

We have added the Canceled option to ShipmentState. You can use this state in situations where you cannot deliver an order to a customer. Previously, this status could only be set using Custom Fields.

Changes:

• [API] Added Canceled to ShipmentState enum.
• [GraphQL API] Added the Canceled enum value to the ShipmentState enum.

The following changes were introduced in terms of GraphQL SDL:

extend enum ShipmentState {
  Canceled
}