Implement the call_v style interfaces.

[casperisfine]

Counterpart to redis-rb/redis-client@ef44f08.

That's the interface redis-rb will use, as it avoid splating arguments all the time. It also happens to simplify redis-cluster-client IMO.

[supercaracal]

Thanks for the improvement. 👍

[casperisfine]

I also pushed a small bugfix: cfb2b7a, various call methods on Pipeline wouldn't execute the passed block.

And 4288704 to help redis-rb decorate the client.