Keep the status of the course index collapsed and expanded sections per user and course

As a user
I want to be able to keep the status of the collapsed and expanded sections
so I can have a consistent view of the course every time I'm back to it

Sections’ status should be stored and used when the same user visits the course back.

Prototype: No specific prototype for collapsing section, so linked to general prototype https://www.figma.com/file/OfCvqK069Oz6Fvqq2xcZWI/Create-a-course?node-id=6%3A0

Acceptance criteria:

1. Users can expand and collapse the sections in the course index.
2. The status of sections will be the same if the user visits a different course and comes back to the current course.
3. The status of sections will be the same if the user log outs and comes back to the current course in a different session.
4. Only actions made actively by user will be kept. If a user expands or collapses a section using mouse or keyboard, that action and new section status should be kept. If a section is expanded because contains the current activity, but has not been expanded actively by user, that section status change shouldn't be kept.