ADD IBAN FIELD TO STRUCTS AND UPDATE PARSING LOGIC

- Added `iban` field to the `IbanEx.Iban` struct to hold the full IBAN value. - Updated the parsing logic to populate
the new field. - Adjusted BBAN rules and tests for France and Brazil to reflect updated structures. - Improved error
handling and format validation routines.

lib/iban_ex/country/template.ex

@@ -93,7 +93,7 @@ defp calculate_rules() do
         {Enum.reverse(list), bban_length}
       end
 
-      defoverridable to_string: 1, to_string: 2, size: 0, rule: 0
+      defoverridable to_string: 1, to_string: 2, size: 0, rule: 0, rules: 0
     end
   end
 end