Add action for view 'External account number' totals to invoice Action menu

Purpose: Before approving invoices certain institutions need to review what will be paid by the business office and from where

User story statement(s):

As an invoicing user
I want to be able to review the total impact an invoice will have on business accounts before approving it
so that I can make sure the business office will be getting the appropriate data before it is sent to them

Scenarios:

1. Scenario:
   • Given user has created an invoice with invoice lines
   • When reviewing the invoice and clicking the action menu
   • Then an option appears for 'View external account number totals'
2. Scenario:
   • Given user has created an invoice with invoice lines
   • When user clicks action 'View external account number totals'
   • Then modal is displayed with totals for all fund distributions on invoice by external account number
   • AND user can close or "X" to dismiss the modal
   • See screenshot