Support split transaction

[varac]

I have recurring transaction that are split across 2 accounts. It would be great if fints2ledger would support this use case, i.e.:

  - match:                                                                                                                                                                          
      payee: "Telefonica Germany GmbH"                                                                                                                                              
    fill:                                                                                                                                                                           
      - purpose: "Shared DSL costs"    
        credit_account: "Expenses:Me"
        amount: 12.00
      - purpose: "Shared DSL costs"    
        credit_account: "Expenses:SomebodyElse"

Where the secont account would be booked with the rest.