feat(metadata): add codec_metadata_v2_to_v3

[LDeakin]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 69.33333% with 23 lines in your changes missing coverage. Please review.

Project coverage is 82.11%. Comparing base (7dfb22f) to head (abbfe4e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
zarrs_metadata/src/v2_to_v3.rs	69.33%	23 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #141      +/-   ##
==========================================
- Coverage   82.13%   82.11%   -0.02%     
==========================================
  Files         173      173              
  Lines       24499    24517      +18     
==========================================
+ Hits        20122    20133      +11     
- Misses       4377     4384       +7     

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