[ENH] Add get_cache_size Utility Function

[JATAYU000]

Metadata

• Reference Issue: Fixes [ENH] Add Cache Size Utility Function #1561
• New Tests Added: Yes
• Documentation Updated: Yes (Doc string)
• Change Log Entry: Add new function get_cache_size() in utils

Details

• What does this PR implement/fix?
  Implements a get_cache_size() function which returns the total size of the openml cache directory in bytes.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.71%. Comparing base (c5f68bf) to head (adf82f6).

Files with missing lines	Patch %	Lines
openml/utils.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1565      +/-   ##
==========================================
- Coverage   53.02%   52.71%   -0.32%     
==========================================
  Files          36       36              
  Lines        4326     4329       +3     
==========================================
- Hits         2294     2282      -12     
- Misses       2032     2047      +15     

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