Adds a course_ids api that can filter by user role, since the courses
api could not perform well enough for this, and returned much more
data than we need.
Additionally, adds a LazyPageNumberPagination to provide more accurate
counts in the pagination response when using LazySequence with the
queryset.
BOM-897
- Remove usage of django.urls.patterns
- Change urls tuples to lists
- Make all string view names callables
- This is the second of several urls updates for LMS; a work in progress
