Adds a reshard-by-split stage as a transform.

[mmcdermott]

Eventually, this may also be used to partially absorb or de-duplicate the sub-sharding and merging code in the extraction code base, but that is out of scope of this PR.

Closes #134

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Codecov Report

Attention: Patch coverage is 83.19328% with 20 lines in your changes missing coverage. Please review.

Project coverage is 92.90%. Comparing base (1b2d023) to head (829cede). Report is 2 commits behind head on dev.

:white_check_mark: All tests successful. No failed tests found.

Files	Patch %	Lines
src/MEDS_transforms/reshard_to_split.py	80.00%	17 Missing :warning:
src/MEDS_transforms/mapreduce/utils.py	90.90%	3 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #135 +/- ## ========================================== - Coverage 93.23% 92.90% -0.34% ========================================== Files 24 25 +1 Lines 1775 1861 +86 ========================================== + Hits 1655 1729 +74 - Misses 120 132 +12 ```

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