Option to skip pdf invoices in case of e-invoicing

[vohmar]

A registrar has asked to opt-out from receiving pdf invoices as they accept e-invoices. Currently they receive both - situation that create some overhead as e-invoices a received directly by accounting, but pdf invoices go through additionl processes creating some unnecessary double work.

To address thiss

• check from estonian business registry if recipient accepts e-invoices
• if e-invoices are accepted send only e-invoices and skip pdf via email
• keep an option for a registrar to opt-in for additional pdf invoices (should be available via the registrar portal)

e-inv recipient query: https://avaandmed.ariregister.rik.ee/en/open-data-api/query-e-invoice-recipients