CLI support for callable class instances

[mauvilsa]

What does this PR do?

Fixes #238

Before submitting

• Did you read the contributing guideline?
• 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)

[indigoviolet]

looks great, thank you for the quick fix!

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov-commenter]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (fff06cc) compared to base (7a184d5).
Patch coverage: 100.00% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff            @@
##            master      #239   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           20        20           
  Lines         5184      5185    +1     
=========================================
+ Hits          5184      5185    +1     

Flag	Coverage Δ
py3.10	87.92% <100.00%> (+<0.01%)	⬆️
py3.10_all	99.88% <100.00%> (+<0.01%)	⬆️
py3.6	87.56% <100.00%> (+<0.01%)	⬆️
py3.6_all	99.63% <100.00%> (+<0.01%)	⬆️
py3.7	87.58% <100.00%> (+<0.01%)	⬆️
py3.7_all	99.80% <100.00%> (+<0.01%)	⬆️
py3.8	87.90% <100.00%> (+<0.01%)	⬆️
py3.8_all	99.84% <100.00%> (+<0.01%)	⬆️
py3.9	87.90% <100.00%> (+<0.01%)	⬆️
py3.9_all	99.86% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
jsonargparse/cli.py	100.00% <100.00%> (ø)
jsonargparse/typehints.py	100.00% <100.00%> (ø)

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