[FIX] pkgmeta: Support PEP-610 direct_url.json

[ales-erjavec]

Issue

Fixes: #317

Since some time pip install -e ... installs a ${NAME}.dist-info dir into site-packages with a direct_url.json recording its origin.
This confuses importlib.metadata (python/cpython#96144)

Changes

Support PEP-610 direct_url.json

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 64.28571% with 10 lines in your changes missing coverage. Please review.

Project coverage is 76.58%. Comparing base (70e3d16) to head (48d4747).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
orangecanvas/utils/pkgmeta.py	64.00%	9 Missing ⚠️
orangecanvas/help/manager.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #319      +/-   ##
==========================================
- Coverage   76.60%   76.58%   -0.03%     
==========================================
  Files         100      100              
  Lines       21217    21240      +23     
==========================================
+ Hits        16253    16266      +13     
- Misses       4964     4974      +10     

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[markotoplak]

Thanks! Works immediately for me on orange3, orange-spectroscopy, orange3-imageanalytics.

Did not work with orange3-fairness, but there I saw a warning DEPRECATION: Legacy editable install of Orange3-Fairness==1.0.1 from file:///home/marko/dev/orange3-fairness (setup.py develop) is deprecated. pip 25.0 will enforce this behaviour change. A possible replacement is to add a pyproject.toml or enable --use-pep517, and use setuptools >= 64. If the resulting installation is not behaving as expected, try using --config-settings editable_mode=compat. Please consult the setuptools documentation for more information. Discussion can be found at https://github.com/pypa/pip/issues/11457

I could fix the orange3-fairness, though, to use the newer way.