Send Bulk Email to users

[harshjohar]

API endpoint to send emails to list of users,

• by roles (IB, EB, Core, members etc)
• by userId (list of email IDs)
• everyone

Should format the email properly, as received by frontend. (Probably frontend will send markdown syntax in string form, parse it in md and send email in proper format)

This also includes, setting up a SMTP SERVER on backend (it was initially set up and removed in #63 (sorry ken🥲, we need email back)