feat: new fields - `base64_encoded_name` and `base64_encoded_product` added to the `ProductInput` message
docs: A comment for field `name` in message `.google.shopping.merchant.products.v1.ProductInput` is changed
docs: A comment for field `name` in message `.google.shopping.merchant.products.v1.Product` is changed
PiperOrigin-RevId: 896968813