CMS : Merge Command

[zmccoy]

Cherry picked from the older branches that were in a rebase stack, this adds the merge command and testing around it for the Count Min Sketch. This is the last command we were missing.

Questions:

1. I'm a bit unclear on replication, and it seems like I'd not want to do verbatim, but am curious as to how to think about that.

Notes:

1. We are still missing the replication testing as a whole, I'm happy to add that here or in another PR after this is done and fix up from there.

[zackcam]

I owuld think verbatim replication is what we want as consistency is key across replica and primaries. Was there a place where you saw this wasn't the case?

[zmccoy]

@zackcam Nothing specific to why it wouldn't work. I think I was pattern matching off the previously done INITBYDIM and INITBYPROB which were not verbatim and followed a similar structure of not having to omit anything.

For my own edification, would INITBYDIM and INITBYPROB also be able to be verbatim? For example: https://github.com/valkey-io/valkey-bloom/blob/count-min-sketch/src/cms/cms_command_handler.rs#L46-L47 ends up recreating the CMS.INITBYPROB key error probability