fix(listing): ignore special 'dir' files

[shcheklein]

Fixes #762

We override fsspec's info to also analyze if an object listed / returned is a special case of a file like this: https://cloud.google.com/storage/docs/objects#simulated-folders

TODO:

• Find a better way / replace isfile / get_info with something else to avoid full listing in fsspec (can be a followup) Info call makes unnecessary long listing for "directories" fsspec/gcsfs#656 or fix GCSF
• Add a test No easy way to create these special files via fsspec. Probably not worth researching this.
• See if we should make _isfile part of the Client

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.38%. Comparing base (508414a) to head (1fdb3df).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #767      +/-   ##
==========================================
+ Coverage   87.37%   87.38%   +0.01%     
==========================================
  Files         116      116              
  Lines       11096    11105       +9     
  Branches     1524     1525       +1     
==========================================
+ Hits         9695     9704       +9     
  Misses       1023     1023              
  Partials      378      378              

Flag	Coverage Δ
datachain	87.32% <100.00%> (+0.01%)	⬆️

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