Add normalize_chunksize and partition utility functions

[eriknw]

No description provided.

[codecov-commenter]

Codecov Report

Base: 69.05% // Head: 69.16% // Increases project coverage by +0.10% 🎉

Coverage data is based on head (6e2a34a) compared to base (edf4f06).
Patch coverage: 65.64% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
+ Coverage   69.05%   69.16%   +0.10%     
==========================================
  Files          75       77       +2     
  Lines        3041     3152     +111     
  Branches      575      602      +27     
==========================================
+ Hits         2100     2180      +80     
- Misses        753      786      +33     
+ Partials      188      186       -2     

Impacted Files	Coverage Δ
...phblas_algorithms/nxapi/shortest_paths/weighted.py	28.94% <40.00%> (+4.55%)	⬆️
graphblas_algorithms/nxapi/cluster.py	78.00% <44.44%> (+1.30%)	⬆️
graphblas_algorithms/nxapi/_utils.py	57.47% <57.47%> (ø)
graphblas_algorithms/nxapi/tests/test_utils.py	100.00% <100.00%> (ø)

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