feat: Support extensions field in array and group metadata (ZEP0009)

[LDeakin]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 20.45455% with 35 lines in your changes missing coverage. Please review.

Project coverage is 81.45%. Comparing base (9c2a5e4) to head (296a58d).

Files with missing lines	Patch %	Lines
zarrs/src/group.rs	17.64%	14 Missing ⚠️
zarrs/src/array.rs	23.52%	13 Missing ⚠️
zarrs_metadata/src/v3/array.rs	20.00%	4 Missing ⚠️
zarrs_metadata/src/v3/group.rs	20.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #152      +/-   ##
==========================================
- Coverage   81.55%   81.45%   -0.11%     
==========================================
  Files         179      179              
  Lines       25638    25682      +44     
==========================================
+ Hits        20910    20919       +9     
- Misses       4728     4763      +35     

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