Exchange jwt token with session cookies so that it can work on mobile. Mobile platform is migrating to jwt and for accessing xblocks we need session cookies in exchnage of jwt token. For additional details, see https://github.com/openedx/edx-platform/blob/master/openedx/core/djangoapps/oauth_dispatch/docs/decisions/0013-mobile-migration-to-jwt.rst LEARNER-8518
auth_exchange ------------- Views to support exchange of authentication credentials. The following are currently implemented: 1. DOTAccessTokenExchangeView View for token exchange from 3rd party OAuth access token to 1st party OAuth access token. Uses django-oauth-toolkit (DOT) to manage access tokens. 2. LoginWithAccessTokenView 1st party (open-edx) OAuth 2.0 access token (bearer/jwt) -> session cookie