Add a Waffle Flag. When enabled, the courseware pages of the
Learning MFE should use the Learning Sequences HTTP API instead
of the Course Blocks HTTP API in order to load course structure
data. We expect that this switchover will lead to performance
improvements and a more comprehensible system.
(We are putting the switchover behind a temporary flag in order to
enable debugging, incremental rollout, and comparison testing.)
The flag is exposed to the MFE via the Course API.
As of this commit, the new flag is not enabled in any environment,
and the MFE does not have any code to act on the flag's value.
So, this commit on its own should have no production impact.
TNL-8330
78f1e2b3bd