Add WorkOrder record type

Related record types that can be added:

  - item_list should be a WorkOrderItemList
  - order_status should be a WorkOrderOrderStatus
  - partners_list should be a PartnersList
  - sales_team_list should be a SalesTeamList

Full documentation:
https://system.netsuite.com/help/helpcenter/en_US/srbrowser/Browser2014_1/schema/record/workorder.html