Add postal code to Person

[Japoivvb]

Describe the solution you'd like
Currently, the "Person" model does not have a postal code field or validation. To improve the model, we should:

• Add a new postalCode field to the "Person" model.
• Implement regex validation to ensure the postal code is in the correct format.
• Update the user interface to handle postal code input and validation when adding or updating a person.

Additional context

• Postal Code Field:

Add a postalCode attribute to the "Person" class with the necessary getter and setter methods.

• Regex Validation:

Use a regex pattern to validate the postal code format. For example, for a typical US postal code format:
String postalCodeRegex = "^(\d{5})(?:[-\s]?\d{4})?$";
This will handle both 5-digit postal codes and extended 9-digit formats (ZIP+4).

• Menu or App Changes:

Update the form or input pane in the app or menu to include the postalCode field.
When adding or editing a person, validate the postal code using the regex. If the postal code is invalid, show an error message like "Invalid postal code format."

• Error Handling in the App:

If the postal code fails validation, prevent the user from saving or updating the record and display a message asking them to enter a valid postal code.

Expected sample