Adds option to create a webshipper return order if return_portal is defined through webshipper options. Return order allows additional features in webshipper, such as marking the return as "Arrived" or "Processed" which enables us to create a webhook and automatically mark return as received in medusa.
Note:
Return portal is a "required" relationship in webshipper when doing a return order POST request, hence it should be defined in options prior to using this feature.
Co-authored-by: Oli Juhl <59018053+olivermrbl@users.noreply.github.com>
