Add upa::path_from_file_url function

[rmisev]

It gets the OS path from the file URL.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (23b097d) 99.73% compared to head (5ccfe4e) 99.73%.

❗ Current head 5ccfe4e differs from pull request most recent head 1dd7759. Consider uploading reports for the commit 1dd7759 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #32   +/-   ##
=======================================
  Coverage   99.73%   99.73%           
=======================================
  Files          16       16           
  Lines        2236     2277   +41     
=======================================
+ Hits         2230     2271   +41     
  Misses          6        6           

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