Add validation for requiring street number in address field on checkout

[piezak]

Dear,

Currently, on checkout the “Street” field allows users to enter the street name without providing a house/apartment number. This often results in incomplete addresses and additional effort from customer support to clarify details.

It would be very helpful to add an option to require a street number when the street field is filled in.

Proposed solution:
• Add a setting in the checkout block configuration (or global WC setting) that enforces the presence of at least one digit in the street field.
• Validation should prevent completing the order if the address does not contain a number.
• Ideally, make it optional (toggle on/off), so each store owner can decide if they want to enforce this rule.

Benefits:
• Reduces failed deliveries and manual corrections.
• Improves data quality in orders.
• Makes the checkout flow more reliable for store owners.

Thanks again to @alexflorisca for improvements to the checkout experience regarding to summary at the bottom of cart, which we talked about on different topic 🙌 – super useful!