Support for Skatteverket SRU file (Swedish Tax Agency)

[brucify]

Skatteverket specifications: SKV269_28_(2022P4).pdf

Without --sru-file:

$ cargo run -- revolut-2023.csv > tax.csv

tax.csv:

Date;Currency;Amount;Income;Cost;Net Income
2023-01-02 10:00:00;EOS;-30;394.86;-182.7450;212.1150
2023-05-06 10:00:00;EOS;-25;495.75;-152.2875;343.4625

With --sru-file:

$ cargo run -- --sru-file --sru-org-num 195012310123 revolut-2023.csv > BLANKETTER.sru

BLANKETTER.sru:

#BLANKETT K4-2023P4
#IDENTITET 195012310123 20230428 152441
#UPPGIFT 3410 55
#UPPGIFT 3411 EOS
#UPPGIFT 3412 891
#UPPGIFT 3413 335
#UPPGIFT 3414 556
#BLANKETTSLUT
#FIL_SLUT