Ability to create a recurring service with a set number of billing cycles

Enabling the user to create a service with a set number of renewal cycles, after which the subscription is cancelled.

This can help users create payment installments for project-based engagements (ex. $5k project for 2 installments of $2.5k) as well as fixed-contract retainer engagements (ex. 6 month contract for web support that automatically cancels after 6 cycles)