Kazakhstan IBAN parsing rules

Examples

    iex>  %IbanEx.Iban{
    ...>    country_code: "KZ",
    ...>    check_digits: "86",
    ...>    bank_code: "125",
    ...>    branch_code: nil,
    ...>    national_check: nil,
    ...>    account_number: "KZT5004100100"
    ...>  }
    ...>  |> IbanEx.Country.KZ.to_string()
    "KZ 86 125 KZT5004100100"