WIP: Pulling Enrollment Count from Analytics API

Similar to #4018, this change demonstrates usage of the Analytics API to populate data on the instructor analytics tab.

DO NOT MERGE
Thanks, I just wanted to double check.

I'll take care of the changes. I don't have a better idea for naming. Recently we have been thinking about naming the pipeline/app "idea", which is the equivalent of insights in other languages.

Good names are hard :(