Add platformdirs as an optional dependency

[mwouts]

Closes #437

[github-actions]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.03%. Comparing base (0960e88) to head (87f4f50).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/itables/show_config.py	50.00%	2 Missing ⚠️
src/itables/config.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #439      +/-   ##
==========================================
- Coverage   94.12%   94.03%   -0.10%     
==========================================
  Files          43       43              
  Lines        1873     1878       +5     
==========================================
+ Hits         1763     1766       +3     
- Misses        110      112       +2     

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[Copilot]

Pull Request Overview

This PR makes platformdirs an optional dependency to resolve issue #437. The change allows ITables to gracefully handle cases where the platformdirs library is not installed, while still providing the configuration file functionality when the optional dependencies are available.

• Adds platformdirs to the optional config dependencies group
• Implements graceful fallback when platformdirs is not available
• Updates documentation to clarify the optional dependency requirement

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
src/itables/version.py	Bumps version to 2.5.2-dev
src/itables/config.py	Adds try/except for platformdirs import and guards user_config_path usage
src/itables/show_config.py	Adds dependency check and user-friendly error message
pyproject.toml	Adds platformdirs to config optional dependencies
docs/py/options/options.py	Updates documentation to mention optional dependencies
docs/options/options.md	Updates documentation to mention optional dependencies
docs/changelog.md	Documents the fix in changelog

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