clerk: journal/parser/testdata/transaction

Oleksandr Smirnov tests: switch to txtar, 3 days ago

-- input --
2024-01-01 ! groceries
-- expect --
Journal
  Transaction j:1:1-2:1
    Date: 2024-01-01
    State: "!"
    Payee: "groceries" j:1:14-2:0