Applications should be able to override the invoicing plugin's resource entity classes through Sylius…

Applications should be able to override the invoicing plugin's resource entity classes through Sylius…: a task in bird-critic-1.5-full-300 (Harbor dataset). Replace the two data "converters" with resource factories, and introduce factories for line items and tax items, so every entity created…

The task

Replace the two data "converters" with resource factories, and introduce factories for line items and tax items, so every entity created during invoice generation is produced by a factory bound to a configurable class name.

Part of kochsnow/bird-critic-1.5-full-300.