[Feature Request] Option to use randomized cakepay.com email instead of providing your own

[ChristopherKing42]

If I understand #471, an email is required to work with the gift card vendors. As a way to increase privacy, I propose an option for Cake Pay itself to provide the email. Each time you purchase a gift card, a random email account with domain cakepay.com would be created. This way the gift card purchases couldn't be linked.