Add support for COG and check remote support in SAR reader

[mraspaud]

This PR adds the filename patterns for the COG versions of the GRD datasets (as distributed by Copernicus Dataspace), and adds tests to check support for FSFiles and UPath.

• Tests added
• Fully documented

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.29%. Comparing base (af52868) to head (8c9c8c9).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3283      +/-   ##
==========================================
- Coverage   96.30%   96.29%   -0.01%     
==========================================
  Files         463      463              
  Lines       58179    58215      +36     
==========================================
+ Hits        56027    56059      +32     
- Misses       2152     2156       +4     

Flag	Coverage Δ
behaviourtests	3.63% <0.00%> (-0.01%)	⬇️
unittests	96.38% <100.00%> (-0.01%)	⬇️

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