Create a new address for a customer

Creates a new address for the specified customer.

Validation Rules:

• country_code: Required, must be a valid ISO 3166-1 alpha-2 code (e.g., US, NZ, AU)
• state_code: Required for US and CA, must be valid for the country
• postcode: Required, must be valid format for the country
• type: Required, must be either BILLING or SHIPPING
• address_line_1: Required, maximum 50 characters
• city: Required, maximum 28 characters
• state: Maximum 35 characters

🔒 Requires: customers:write scope