Allow users to "favorite" learning resources - front end

[mbertrand]

User Story

As a user, I want to bookmark some learning resources as "favorites"

Description/Context

This is a port of existing functionality in open-discussions, where any authenticated user can add/remove courses, programs, videos, podcasts, and public lists as favorites.

Acceptance Criteria

• Via a UI, each user can list/unlist any learning resource as a favorite, and view their list of favorites, and for any particular carousel/search result of resources, see which have been favorited.

Plan/Design

Once the backend API has been implemented, the UI should look similar if not identical to that of the corresponding open-discussions UI.