Ab/upgrade icechunk

[abarciauskas-bgse]

Just opening this as a draft PR to share the changes I implemented to get icechunk>=0.1.0a10 to work.

I believe we will need a more complete redesign and refactor of how we're handling codecs and zarr-python 3.0 integration across the codebase.

[codecov]

Codecov Report

Attention: Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.

Project coverage is 78.75%. Comparing base (908ad94) to head (079e480).
Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
virtualizarr/zarr.py	14.28%	6 Missing ⚠️
virtualizarr/codecs.py	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (12.50%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #378      +/-   ##
==========================================
- Coverage   79.11%   78.75%   -0.37%     
==========================================
  Files          32       32              
  Lines        1906     1911       +5     
==========================================
- Hits         1508     1505       -3     
- Misses        398      406       +8     

Files with missing lines	Coverage Δ
virtualizarr/writers/icechunk.py	0.00% <ø> (ø)
virtualizarr/codecs.py	60.00% <0.00%> (ø)
virtualizarr/zarr.py	72.47% <14.28%> (-2.53%)	⬇️

... and 2 files with indirect coverage changes

[rabernat]

Just wanted to note that I successfully used this branch to create an Icechunk virtual dataset for GPM IMERG with Icechunk 0.1.0.a12. 🙌

[abarciauskas-bgse]

Closing in favor of #406