DATAREDIS-1042 - Add support for MKSTREAM parameter when creating a Consumer Group

[tgrall]

It is my first contribution to Spring Data/Spring Data Redis, so I am not used yet to this project.

I have not done anything serious with Kotlin, I will need some help from the community to add more tests.

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[mp911de]

Thank you for your contribution. That's merged and polished now. We decided to create groups always with MKSTREAM enabled when using the operations API which is the typical abstraction being used. On the connection level, we preserved the option to set MKSTREAM.