User can view enrollment breakdown for course

[crathbun428]

User Story
As a course author, I want to view details of the enrollment breakdown for my course, so that I know who is in my course, what enrollment track they're on (when applicable), and I am able to compare the enrollment for this course against my other courses.

Acceptance Criteria
Scenario: A course author can view enrollment information for their course from the course dashboard
Given I am a course author with X permissions
When I navigate to the course dashboard
Then I can see the number of total learners enrolled in my course
And I can see the number and percent of total enrollees for current enrollees and enrollees per enrollment track (of enrollment tracks available on my instance)
And when an enrollment track is not available on my instance
Then I don't see it listed in the enrollment data for my course dashboard

[SoryRawyer]

I think this can be charted using the fact_enrollments dataset in Superset.