feature/INT-1637 - Payment Request Product Type and Subtype to nullable

[david-ruiz-cko]

This pull request adds support for product item types and subtypes in the payments module, improving the structure and clarity of product-related attributes. The main changes include introducing new enumerations for product item types and subtypes, updating documentation for better clarity, and requiring the new files where appropriate.

Product Type Support Enhancements

• Added a new ProductItemType enumeration in product_item_type.rb, defining possible product types such as digital, discount, and physical.
• Updated the product.rb documentation to clarify the usage of the type and sub_type attributes, specifying their purpose and when they are required.
• Required the new product_item_type and product_sub_type files in payments.rb to ensure the enumerations are available throughout the payments module.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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