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Add ability to split shards #26931
This change adds a new
The split operation is conceptually an inverse
This change is intended for the 6.1 feature release but will not support pre-6.1
@s1monw It's not clear to me that splitting this PR will make it easier to review. I think that this PR looks big, but it has a conceptual nut that once you grok, the rest of the PR is ceremony/piping around that, and docs and tests. I sometimes (not always) find these larger changes easier to digest if I can see the entire picture at once (like in the initial CCS PR).