anndata.abc.CS{RC}Dataset support

[flying-sheep]

Fixes #4

TODO:

• investigate if we should support sum and mean_var: See Maybe support stats for anndata.abc.CS*Dataset with anndata 0.12 #52

[codspeed-hq]

CodSpeed Performance Report

Merging #50 will degrade performances by 14.58%

_{Comparing pa/cs-dataset (1af2d6a) with main (c854c5b)}

Summary

❌ 2 (👁 2) regressions
✅ 86 untouched benchmarks

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
👁	test_stats_benchmark[1-scipy.sparse.csr_array-float32-is_constant]	277.1 µs	323.7 µs	-14.37%
👁	test_stats_benchmark[1-scipy.sparse.csr_array-float64-is_constant]	103.1 µs	120.7 µs	-14.58%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.53%. Comparing base (c854c5b) to head (1af2d6a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #50      +/-   ##
==========================================
+ Coverage   94.80%   96.53%   +1.73%     
==========================================
  Files          14       14              
  Lines         231      231              
==========================================
+ Hits          219      223       +4     
+ Misses         12        8       -4     

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