[Swift language features] Bind property getters

[jkurdek]

To implement simple in-app purchase flow using StoreKit framework, we want to expose property accessors, such as:

• https://developer.apple.com/documentation/storekit/product/displayname
• https://developer.apple.com/documentation/storekit/product/description
• https://developer.apple.com/documentation/storekit/product/displayprice
• https://developer.apple.com/documentation/storekit/product/price