feat(redwood): backport instructor APIs conversion to DRF

[Agrendalath]

TODO: Add testing instructions.

curl -X POST -d "grant_type=password&client_id=test&client_secret=test&username=<email>&password=<password>&token_type=jwt" http://localhost:18000/oauth2/access_token

Authorization: JWT <token>

http://localhost:18000/courses/course-v1:edX+DemoX+Demo_Course/instructor/api/modify_access
form-data:

unique_student_identifier:audit
rolename:staff
action:allow // (or "revoke")

http://localhost:18000/courses/course-v1:edX+DemoX+Demo_Course/instructor/api/list_course_role_members
form-data:

rolename:staff

Private-ref: BB-9250