add redis and sidekiq to clean up expired blacklisted jwt

[chris-t-li]

This addresses Issue #149

1. Add gems: sidekiq and sidekiq-cron;
2. Create sidekiq_cron.rb that specifies when and what task shall be run;
3. Create cleanup_expired_jwt_job.rb that provies the function for deleting blacklisted expired JWT;
4. Update docker-compose.yaml to add redis and sidekiq services

To test;

1. Uncomment Line 4 of cleanup_expired_jwt.rb and comment out Line 3. (This changes the timing of the background task to run every minute rather than every day. This is just for testing purposes. After test. Reverse this step).

2. Rebuild application given changes to gemfile and docker compose file;

docker-compose up --build

3. Console should show 5 services: db, api, client, redis and sidekiq;
4. In a new terminal, run

docker compose run api rails console
BlacklistedToken.all

This should show a list of all blacklisted tokens.
5. Navigate to localhost:4000. Login as any user and then logout (to create the blacklisted token).
6. In the rails console, run BlacklistedToken.all again. You should see 2 new instances that were created by logging out in step 4.
7. Wait ~ 1 minute then check the docker terminal. You should see something like this:

8. In the rails console, run BlacklistedToken.all again. You should see the two instances have been deleted:

9. After testing is complete. Reverse step 1 by commenting out Line 4 of cleanup_expired_jwt.rb and uncomment Line 3.

Note: have only tested this in localhost and dev environment. Will test in production next.

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