Spike: can we get email addresses to send grantee notifications?

[meglister]

Overview
One of our potential feature improvements for Checker is to implement email notifications to grantees that will automatically send to notify them of status changes to their application (eg - received, rejected, approved.) This has been on both the grantee and round manager wishlist for quite a while! We implemented email notifications to round managers during GG20 to notify them that they had received new applications to review. It's a bit trickier to notify grantees because we encrypt their email addresses using LIT and will have to decrypt the email addresses and send those to a mail service.

Details
The goal of this ticket is to do a spike to determine if/how email notifications might be possible with the decryption issue.