Support option CREATECONSUMER in XGROUP command

[dengliming]

closes #1505

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[mp911de]

Thank you for your contribution. That's merged now.

[spathros]

xGroupConsumerName ("key", Consumer.from("group1", "c1")) is failing with below error:
io.lettuce.core.RedisCommandExecutionException: ERR Unknown subcommand or wrong number of arguments for 'CREATECONSUMER'. Try XGROUP HELP.

How to resolve this? I see the args are passed in correctly