Add h5split

[samvanstroud]

Summary

This pull request introduces the following changes

• Add a function to split a large h5 into several smaller h5

Conformity

• [x] Changelog entry
• [x] Documentation

[codecov[bot]]

Codecov Report

Merging #47 (f3fd4b3) into main (567b4c2) will increase coverage by 0.05%. The diff coverage is 99.06%.

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
+ Coverage   98.11%   98.17%   +0.05%     
==========================================
  Files          29       31       +2     
  Lines        1433     1534     +101     
==========================================
+ Hits         1406     1506     +100     
- Misses         27       28       +1     

Files Changed	Coverage Δ
ftag/hdf5/h5split.py	97.67% <97.67%> (ø)
ftag/hdf5/h5move.py	100.00% <100.00%> (ø)
ftag/hdf5/h5reader.py	97.35% <100.00%> (ø)
ftag/hdf5/h5writer.py	97.22% <100.00%> (+0.61%)	:arrow_up:
ftag/mock.py	100.00% <100.00%> (ø)
ftag/tests/hdf5/test_h5move.py	100.00% <100.00%> (ø)
ftag/tests/hdf5/test_h5split.py	100.00% <100.00%> (ø)
ftag/tests/hdf5/test_h5writer.py	100.00% <100.00%> (ø)

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