Fully implement toggle state report outside of edx-platform

[robrap]

Complete implementation of toggle state report outside of edx-platform

Notes:

• See how-to report on new IDA.
• Apply to credentials, which was already mocked.
  • Replace credentials mock toggle state endpoint with a real endpoint.
  • Update the rest of the config according to the how-to.
• Update the how-to to provide a simpler example than edx-platform (which overrides the report).
• Once ready, make this default behavior in cookiecutter-django-ida in https://github.com/edx/edx-cookiecutters/.
  • This could be created as a separate cookiecutter ticket once this ticket is complete.