(feat): remove sparse data scipy inheritance

[ilan-gold]

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

[codecov]

Codecov Report

Attention: Patch coverage is 28.08219% with 105 lines in your changes missing coverage. Please review.

Project coverage is 26.81%. Comparing base (098639e) to head (c1be255).

Files with missing lines	Patch %	Lines
src/anndata/_core/sparse_dataset.py	28.27%	104 Missing ⚠️
src/anndata/compat/__init__.py	0.00%	1 Missing ⚠️

❌ Your project check has failed because the head coverage (26.81%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

❗ There is a different number of reports uploaded between BASE (098639e) and HEAD (c1be255). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (098639e)	HEAD (c1be255)
	3	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1927       +/-   ##
===========================================
- Coverage   86.51%   26.81%   -59.70%     
===========================================
  Files          45       44        -1     
  Lines        6798     6773       -25     
===========================================
- Hits         5881     1816     -4065     
- Misses        917     4957     +4040     

Files with missing lines	Coverage Δ
src/anndata/compat/__init__.py	9.50% <0.00%> (-73.68%)	⬇️
src/anndata/_core/sparse_dataset.py	35.60% <28.27%> (-56.78%)	⬇️

... and 43 files with indirect coverage changes

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