Monthly and Yearly Pricing on Packages

Sometimes I don't want a package to have a yearly price, and sometimes I don't want a monthly price. We need to be able to disable one or the other in the frontend.

My suggestion would be adding another Stripe price API field to the package config, if no key is present then that price option does not display in the frontend. Something like this would display both monthly and yearly pricing:

Doing this would also allow use of the multiple pricing options in Stripe, so a single product could have a monthly and yearly price specified as well: