Supplier invoices: expose and filter by electronic billing address

The Company API v2 now exposes the electronic address the supplier invoice was routed to as electronic_billing_address inside the existing e_invoicing object.

{
  "e_invoicing": {
    "electronic_billing_address": "123456789_12345678912345"
  }
}

The field is null for invoices that were not received through e-invoicing.

electronic_billing_address is now also available as a filter on the list endpoint, with operators: eq, not_eq, in, not_in.

No breaking changes. electronic_billing_address is a new optional field, existing integrations are unaffected.