feat: add ArrayShardedReadableExt::retrieve_encoded_inner_chunk

[LDeakin]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 94.18605% with 10 lines in your changes missing coverage. Please review.

Project coverage is 81.68%. Comparing base (287bb15) to head (bac776f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
zarrs/src/array/array_sync_sharded_readable_ext.rs	94.28%	8 Missing ⚠️
...rray_to_bytes/sharding/sharding_partial_decoder.rs	92.59%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #110      +/-   ##
==========================================
+ Coverage   81.59%   81.68%   +0.08%     
==========================================
  Files         166      166              
  Lines       23605    23756     +151     
==========================================
+ Hits        19261    19405     +144     
- Misses       4344     4351       +7     

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