feat: remove sparse data scipy inheritance

[ilan-gold]

• Closes #
• Tests added
• Release note added (or unnecessary)

[codecov]

Codecov Report

❌ Patch coverage is 90.78947% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.39%. Comparing base (2b5be1e) to head (b6575b7).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/anndata/_core/sparse_dataset.py	90.72%	14 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1927       +/-   ##
===========================================
+ Coverage   70.95%   85.39%   +14.44%     
===========================================
  Files          46       46               
  Lines        7064     7053       -11     
===========================================
+ Hits         5012     6023     +1011     
+ Misses       2052     1030     -1022     

Files with missing lines	Coverage Δ
src/anndata/compat/__init__.py	80.99% <100.00%> (+11.90%)	⬆️
src/anndata/_core/sparse_dataset.py	89.36% <90.72%> (+6.07%)	⬆️

... and 26 files with indirect coverage changes