Add support for an Http server storage backend

[zoj613]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 92.13483% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.17%. Comparing base (22bd73a) to head (b77cfe4).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
zarr-eio/src/storage.ml	90.47%	4 Missing ⚠️
zarr/src/storage/http.ml	93.61%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #85      +/-   ##
==========================================
- Coverage   98.52%   98.17%   -0.35%     
==========================================
  Files          13       14       +1     
  Lines        1555     1644      +89     
==========================================
+ Hits         1532     1614      +82     
- Misses         23       30       +7     

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