Changes to GET /api/inventory/purchaseorder/:id

the expected_entry_date response's property format changed from date to no format for status 200

added the required property expected_entry_date_iso to the response with the 200 status

added the required property color to the response with the 200 status

added the required property statuscode_id to the response with the 200 status

added the required property text_color to the response with the 200 status