[clbarnes]

Summary

Resolves #4541 .

Implements the reshape extension codec.
This codec was recommended for inclusion in mainline zarr-python because it will be built on top of by other codecs (e.g. most image codecs).

Author attestation

• I am a human, these are my changes, and I have reviewed and understood every change and can explain why each is correct.

TODO

• Add unit tests and/or doctests in docstrings
• Add docstrings and API docs for any new/modified user-facing classes and functions
• New/modified features documented in docs/user-guide/*.md
• Changes documented as a new file in changes/
• GitHub Actions have all passed
• Test coverage is 100% (Codecov passes)

[codecov]

Codecov Report

❌ Patch coverage is 98.93617% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 94.74%. Comparing base (3d73e29) to head (cde8c5d).

Files with missing lines	Patch %	Lines
src/zarr/codecs/reshape.py	98.91%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4542      +/-   ##
==========================================
+ Coverage   94.71%   94.74%   +0.02%     
==========================================
  Files          94       95       +1     
  Lines       13663    13757      +94     
==========================================
+ Hits        12941    13034      +93     
- Misses        722      723       +1     

Files with missing lines	Coverage Δ
src/zarr/codecs/__init__.py	100.00% <100.00%> (ø)
src/zarr/codecs/reshape.py	98.91% <98.91%> (ø)

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