[Improvement]: Update Subscriber Logic to Listen to Redis Pub/Sub Instead of Database

Update the existing subscriber logic to listen to messages from Redis Pub/Sub channels instead of polling the database.

Modify the code to subscribe to a Redis Pub/Sub channel and receive messages directly from Redis.
Ensure proper handling of incoming messages, including deserialization and processing.
Validate that the subscriber correctly receives and processes messages from the Redis Pub/Sub channel.

hngprojects / hng_boilerplate_nextjs