ShareDB Redis PubSub Adapter

Redis pub/sub adapter for ShareDB, enabling horizontal scalability by forwarding operations across multiple server nodes in a cluster. Stable version 5.1.0, maintained as part of the ShareDB ecosystem. Uses Redis publish/subscribe to broadcast operations to all nodes, ensuring no race conditions with persistence. Compared to other pub/sub adapters (e.g., Kafka), it is lightweight and leverages Redis's built-in pub/sub, making it ideal for setups already using Redis. Requires a Redis client instance and ShareDB backend.