Add "order type" in in orders export

[r0xsh]

To improve the efficiency of the graph, adding a column to differentiate orders based on their type could be very helpful. The column should have only two possible values:

• FOODTECH
• LASTMILE

[Paul-Eraman-CoopCycle]

We talked about letting coops define shops or stores with custom categories, im guessing thats a lot more work though