Add Notifications Module for SES

[avrohomgottlieb]

Context

Issue #1037 added the necessary terraform resources to enable ses support, and verified successful functionality of email sending.

Problem or idea

This issue will focus on adding the necessary application code to utilize our new ses resources.

Solution or next step

Next steps include:

• Add a notifications.py module (with the intention of using it for both ses email and slack messaging logic)
  • Start out with a send_email function
• Add a basic html template that can be referenced in the outgoing email
• Add a notify flag to the generate_computed_file management command
• Add a call to the notifications::send_email in the generate_computed_file management command, which should fire if the notify flag is set to True