Set getAvailableStock() to be ignore by Jackson json serializer to avoid seding duplicate data. getStock() already send item's stocks.
Modifies createOrpdate() to also detect stocks param, and update item's stockPerSize amount. Refector find.byId() to search by id, and creates findBySize.
Adds logic to edit item's images, and stocks' leves per size from edit view in garmentManager.