Allow ini format to support nested structures.

[fabiocaccamo]

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name: Pull request
about: Submit a pull request for this project
assignees: fabiocaccamo

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Describe your changes
Allow ini format to support nested structures by encoding/decoding (json format) values that are collections (dict, list, set, tuple).

Related issue
Fix #284

Checklist before requesting a review

• I have performed a self-review of my code.
• I have added tests for the proposed changes.
• I have run the tests and there are not errors.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02 🎉

Comparison is base (9e07e48) 96.50% compared to head (332638d) 96.52%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #289      +/-   ##
==========================================
+ Coverage   96.50%   96.52%   +0.02%     
==========================================
  Files          61       61              
  Lines        1832     1844      +12     
==========================================
+ Hits         1768     1780      +12     
  Misses         64       64              

Flag	Coverage Δ
unittests	96.52% <100.00%> (+0.02%)	⬆️

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

Impacted Files	Coverage Δ
benedict/serializers/ini.py	100.00% <100.00%> (ø)

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