Palestine IBAN parsing rules

Examples

    iex>  %IbanEx.Iban{
    ...>    country_code: "PS",
    ...>    check_digits: "92",
    ...>    bank_code: "PALS",
    ...>    branch_code: nil,
    ...>    national_check: nil,
    ...>    account_number: "000000000400123456702"
    ...>  }
    ...>  |> IbanEx.Country.PS.to_string()
    "PS 92 PALS 000000000400123456702"