Ireland IBAN parsing rules

Examples

    iex>  %IbanEx.Iban{
    ...>    country_code: "IE",
    ...>    check_digits: "29",
    ...>    bank_code: "AIBK",
    ...>    branch_code: "931152",
    ...>    national_check: nil,
    ...>    account_number: "12345678"
    ...>  }
    ...>  |> IbanEx.Country.IE.to_string()
    "IE 29 AIBK 931152 12345678"