Valid import path for classes created with class_from_function

[mauvilsa]

What does this PR do?

Implements #309 (comment)

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• Did you update the documentation? (readme and public docstrings)
• Did you write unit tests such that there is 100% coverage on related code? (required for bug fixes and new features)
• Did you verify that new and existing tests pass locally?
• Did you make sure that all changes preserve backward compatibility?
• Did you update the CHANGELOG? (not for typos, docs, test updates, or minor internal changes/refactors)

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (8e23b51) 100.00% compared to head (45c3902) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #315   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           21        21           
  Lines         5528      5537    +9     
=========================================
+ Hits          5528      5537    +9     

Flag	Coverage Δ
py3.10	86.56% <100.00%> (+0.02%)	⬆️
py3.10_all	98.33% <100.00%> (+<0.01%)	⬆️
py3.10_types	98.33% <100.00%> (+<0.01%)	⬆️
py3.11	86.54% <100.00%> (+0.02%)	⬆️
py3.11_all	98.32% <100.00%> (+<0.01%)	⬆️
py3.11_types	98.32% <100.00%> (+<0.01%)	⬆️
py3.6	85.97% <100.00%> (+0.02%)	⬆️
py3.6_all	97.81% <100.00%> (+<0.01%)	⬆️
py3.7	87.96% <100.00%> (+0.01%)	⬆️
py3.7_all	99.47% <100.00%> (+<0.01%)	⬆️
py3.7_types	99.45% <100.00%> (+<0.01%)	⬆️
py3.8	88.13% <100.00%> (+0.01%)	⬆️
py3.8_all	99.51% <100.00%> (+<0.01%)	⬆️
py3.8_types	99.49% <100.00%> (+<0.01%)	⬆️
py3.9	88.06% <100.00%> (+0.01%)	⬆️
py3.9_all	99.54% <100.00%> (+<0.01%)	⬆️
py3.9_types	99.54% <100.00%> (+<0.01%)	⬆️

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Files Changed	Coverage Δ
jsonargparse/_util.py	100.00% <100.00%> (ø)

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