Modification of cinema example to use Redis.

[cmeiklejohn]

For this example, it would be best to work with cinema-11 in the Filibuster Research Corpus.

General thoughts:

• Modify movies to use Redis.
  • Any use of files should be modified to use Redis.
• Modify bookings to use Redis.
  • Any use of files should be modified to use Redis.
  • API provides an update function -- that modifies global state and should instead use Redis.
  • Put a circuit breaker around the function that performs the GET/POST similar to the examples already in cinema-11.
• Modify users to use Redis.
  • Any use of files should be modified to use Redis.

We should try to pick a Redis client that has opentelemetry instrumentation for Python, if possible. This would be the same as we did for the requests instrumentation.