Post inventory transfer, transfer type

[Per-Willy]

In the UI for inventory transfer its possible to choose 1 or 2 step transfer type. We request that Transfer type can be used in Post  /controller/api/v1/inventoryTransfer.

[Magnus Johnsen]

There is currently a case in the backlog for exposing "TransferType" on the InventoryTransfer endpoint. 

[Daniel-Jansson]

We still need this.