add can_read classmethod to ZarrIO

[bendichter]

add test for new method

Motivation

NeurodataWithoutBorders/pynwb#859 (comment)

How to test the behavior?

ZarrIO.can_read(path)

Checklist

• Did you update CHANGELOG.md with your changes?
• Have you checked our Contributing document?
• Have you ensured the PR clearly describes the problem and the solution?
• Is your contribution compliant with our coding style? This can be checked running ruff from the source directory.
• Have you checked to ensure that there aren't other open Pull Requests for the same change?
• Have you included the relevant issue number using "Fix #XXX" notation where XXX is the issue number? By including "Fix #XXX" you allow GitHub to close issue #XXX when the PR is merged.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.06 🎉

Comparison is base (3c2bb12) 81.94% compared to head (26cad63) 82.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev      #97      +/-   ##
==========================================
+ Coverage   81.94%   82.00%   +0.06%     
==========================================
  Files          11       11              
  Lines        2647     2657      +10     
==========================================
+ Hits         2169     2179      +10     
  Misses        478      478              

Impacted Files	Coverage Δ
src/hdmf_zarr/backend.py	87.87% <100.00%> (+0.12%)	⬆️
tests/unit/base_tests_zarrio.py	98.74% <100.00%> (+<0.01%)	⬆️

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