*Redis 中 Pub/Sub（发布/订阅）相关的命令

• PSUBSCRIBE
• PUBLISH
• PUBSUB
  • PUBSUB CHANNELS [pattern]
  • PUBSUB NUMSUB [channel-1 ... channel-N]
  • PUBSUB NUMPAT
• PUNSUBSCRIBE
• SUBSCRIBE
• UNSUBSCRIBE