Support redis cluster client

[si3nloong]

This PR will allow us to pass redis client or redis cluster client, example :

var client redis.Cmdable
if cluster {
  client = redis.NewClusterClient(&redis.ClusterOptions{
	  Addrs:    []string{"127.0.0.1:8000", "127.0.0.1: 8001"},
  })
} else {
  client = redis.NewClient(&redis.Options{
	  Addr:    "127.0.0.1:8000",
  })
}

errChan := make(chan error, 1)
rmq.OpenConnectionWithRedisClient("queue-name", client, errChan)

Noted: There have no breaking change in this PR, as long as we are using redis/v8 (this will comply to the interface)

[wellle]

Seems good, thank you!