Description: Allow documents attached to an order via the Document Manager to be printed automatically when the order is printed.

Currently, attached documents must be opened and printed manually. The request is to include an option where, when a shipping label is printed, all attached documents are printed at the same time.

Ideal behaviour: When printing an order, Starshipit automatically prints the shipping label along with any documents attached to the order, with an optional toggle to enable or disable this behaviour.