Support Zarr 2 and 3 (again)

[jeromekelleher]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 72.72727% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.54%. Comparing base (6407cc1) to head (c2b779d).
⚠️ Report is 41 commits behind head on main.

Files with missing lines	Patch %	Lines
tszip/_zarr_compat.py	62.50%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #146      +/-   ##
==========================================
- Coverage   97.32%   95.54%   -1.78%     
==========================================
  Files           6        7       +1     
  Lines         337      382      +45     
  Branches       56       64       +8     
==========================================
+ Hits          328      365      +37     
- Misses          7        9       +2     
- Partials        2        8       +6     

Flag	Coverage Δ
python-tests	95.54% <72.72%> (?)
tszip	?

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