Use OS-specific cache directories for get_data_home and add tests #31438
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Fixes #31267
This PR updates the get_data_home function to use platform-specific cache directories for storing scikit-learn datasets:
On Linux, it uses $XDG_CACHE_HOME/scikit_learn_data if set, otherwise falls back to ~/.cache/scikit_learn_data.
On macOS, it uses ~/Library/Caches/scikit_learn_data.
On Windows, it uses %LOCALAPPDATA%\scikit_learn_data.
Maintains support for the SCIKIT_LEARN_DATA environment variable override.
Adds new tests to verify this platform-specific behavior.
Fixes some linting and import organization in the related files.
This improves compliance with OS standards for cache storage and prevents cluttering the user’s home directory.
Ready for review. Happy to address feedback or make adjustments as needed.