Returns the AWS Marketplace product listings owned by the authenticated
seller. Use this to populate a product picker before creating a private
offer.

Each product object includes two distinct identifiers:

• productid -- the Tackle product identifier.
• encrypted_productid -- the AWS Marketplace Catalog API product
  identifier. This is the value to pass as the productId path
  parameter on GET /products/{productId}/pricing. Passing
  productid instead will result in a 404 because the pricing
  endpoint is sourced from the AWS Catalog API and only understands
  the encrypted form.