Redis Stack use cases

[nermiller]

Adds new section in the Redis Stack category

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[itamarhaber]

LGTM, didn't review the content :) Perhaps @K-Jo should be the final reviewer?

[banker]

Initial review

[nermiller]

@LiorKogan, please review one more time. I've added t-digest and responded to your comments. cc @banker

[LiorKogan]

I noticed that some probabilistic data structures are mentioned by name (HyperLogLog, TopK) but others do not. I think we should name them all.
I think it would be better to list the different probabilistic data structures and the questions each can answer, and then give a separate set of use cases for each. Otherwise, it is a little bit confusing.

I listed those questions for all data structures in https://redislabs.atlassian.net/wiki/spaces/DX/pages/3620077569/t-digest+A+New+Probabilistic+Data+Structure+in+RedisBloom.

You can copy from there if you wish.

I also think we should include HyperLogLog because it is also a probabilistic data structure, but mention that it is included in core Redis.

[nermiller]

@LiorKogan I've added back the headings for probabilistic data structures. Mind checking it again? Thank you so much!

[LiorKogan]

Looks good!

[nermiller]

@banker, please review so I can merge. Thank you! Many thanks, @LiorKogan!