✨ Add BLMPOP

[JerrodCarpenter]

• Adding BLMPOP
• Adding support for Redis 7.0 commands #1187

➜  redis-rb git:(BLMPOP) ./bin/console 
irb(main):001:0> redis = Redis.new(url: "redis://localhost:6379/2")
=> #<Redis client v5.0.6 for redis://localhost:6379/2>
irb(main):002:0> redis.rpush("list", [6, 1, 2, 3, 4, 5, 6])
=> 9
irb(main):003:0> redis.lmpop(1, "list")
=> ["list", ["4"]]
irb(main):004:0> redis.blmpop(1, "list")
=> ["list", ["3"]]
irb(main):005:0> redis.blmpop(1, "list", modifier: "RIGHT")
=> ["list", ["6"]]
irb(main):006:0> redis.lmpop(1, "list1", "list", modifier: "RIGHT", count: 2)
=> ["list", ["5", "4"]]
irb(main):007:0> redis.blmpop(1, "list1", "list", modifier: "RIGHT", count: 2)
=> ["list", ["3", "2"]]