Add support for remote datasets

[berombau]

This is the PR to close #441.

[codecov]

Codecov Report

Attention: Patch coverage is 86.86869% with 13 lines in your changes missing coverage. Please review.

Project coverage is 92.01%. Comparing base (4021946) to head (d9e4eac).

Files with missing lines	Patch %	Lines
src/spatialdata/_io/_utils.py	76.47%	8 Missing ⚠️
src/spatialdata/_io/io_zarr.py	89.18%	4 Missing ⚠️
src/spatialdata/_io/io_raster.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #842      +/-   ##
==========================================
- Coverage   92.11%   92.01%   -0.10%     
==========================================
  Files          48       48              
  Lines        7429     7468      +39     
==========================================
+ Hits         6843     6872      +29     
- Misses        586      596      +10     

Files with missing lines	Coverage Δ
src/spatialdata/_core/spatialdata.py	91.57% <100.00%> (+0.11%)	⬆️
src/spatialdata/_io/io_points.py	100.00% <100.00%> (ø)
src/spatialdata/_io/io_shapes.py	95.08% <100.00%> (-0.08%)	⬇️
src/spatialdata/_io/io_table.py	94.00% <100.00%> (-0.45%)	⬇️
src/spatialdata/_io/io_raster.py	96.12% <90.00%> (-0.73%)	⬇️
src/spatialdata/_io/io_zarr.py	87.82% <89.18%> (-0.64%)	⬇️
src/spatialdata/_io/_utils.py	86.52% <76.47%> (-1.93%)	⬇️

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[LucaMarconato]

These are the diffs from the old PR that got closed because of the many merge conflicts. Let's use this code to shape the new implementations.

• https://github.com/scverse/spatialdata/pull/442/files/7bb87ba5da68ab9fb4a0a7dcd06751b36290d4c1
• https://github.com/scverse/spatialdata/pull/442/files/e6b6ae9502520f4e54f856787d3874d90a89058c..e3e0c28638ba932c62d04e6b03e4ca711d61bf27
• https://github.com/scverse/spatialdata/pull/442/files/f1d4f27ec5e6bfc8fed36032bf50ab831d3a453f..74283b1092b8858f46e7b5980a57b6b4c03d1575

[berombau]

I added my progress. Local read/write behavior should still work. Remote reading for raster (image, labels) elements is added. The tests succeeded locally and I expanded the remote tests for future work on reading and writing all elements.

Next steps are:

• merging with the incremental reading now in main
• finish the public element read functions
• merge

Out-of-scope for this PR:

• support for the remaining points, shapes and tables elements
• support writing to remote

[LucaMarconato]

Thanks @berombau! I will take over for this 😊 (timeline, working on 2-3 PRs and then I want to work on this next).