Add commands for list course and status to send via email

[payamnj]

For the command handler add supports for this two commands:

• course_list_email:
  accepts: email, organization_id
  get the list of published courses by an organization and send the list of courses with their slug, description and if the imap interface is activated for them instruction to register via email.

• status_to_email:
  accepts: email, organization_id
  Check all the courses that an email address are enrolled in for the organization and send an email showing their progress for each course.. There should be a link to a personalized page with token to see the status and charts, badges.

The emails should support AMP content type for better user interaction to register for new courses and see the charts for status.