Add new service to send email/notification when a new comment is created

[tgrall]

No description provided.

[chromonav]

@tgrall to implement this we would need to user management bit also. We need to make a business decision as to how much we want implement for this use case.
For now we can just publish to SNS topic when a comment is created.

[tgrall]

Yes this is ok, this is just to give an idea about the flow of an application