Missing delivery date and time in customer invoice

[biologeek]

Currently when a customer orders in Woocommerce, Coopcycle handles delivery date and time through this plugin.

Thus when order is validated, Coopcycle knows of delivery datetime but not Woocommerce. Thus Woocommerce admins are not aware if order is due for tomorrow or another day.

Seems like we should add an action to update shipping method (see here)

Eventually also update pdf invoice with a new custom block mentioning order delivery date (see there)