feat: add anndata.acc support to mask params

[flying-sheep]

TODO:

• probably good to unify _mask_arg with _check_mask?
• think about if it makes sense to rename from mask_{obs,var} to mask:
  • not explicit from param name anymore which dim is masked
  • but explicit through argument (e.g. mask="obs.xy")
  • also good fit for functions that can operate on either axis (sample, aggregate) or allow to mask either or both axes (e.g. pca could be fit on a subset or scale could be called on a subset)

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• Closes anndata.acc based API for mask/mask_{obs,var} #4331
• Tests included or not required because:

• Release notes not necessary because:

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✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.93%. Comparing base (a656a33) to head (8d909d6).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4333      +/-   ##
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- Coverage   81.98%   81.93%   -0.06%     
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  Files         134      134              
  Lines       13235    13019     -216     
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- Hits        10851    10667     -184     
+ Misses       2384     2352      -32     

Flag	Coverage Δ
hatch-test.low-vers	78.81% <87.50%> (-0.26%)	⬇️
hatch-test.pre	81.80% <100.00%> (-0.06%)	⬇️

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Files with missing lines	Coverage Δ
src/scanpy/_docs.py	100.00% <100.00%> (ø)
src/scanpy/_settings/presets.py	93.15% <100.00%> (ø)
src/scanpy/_utils/__init__.py	75.57% <100.00%> (ø)
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src/scanpy/get/_aggregated.py	95.28% <100.00%> (+0.03%)	⬆️
src/scanpy/get/get.py	91.08% <100.00%> (+1.19%)	⬆️
src/scanpy/preprocessing/_docs.py	100.00% <100.00%> (ø)
src/scanpy/preprocessing/_highly_variable_genes.py	94.63% <ø> (ø)
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src/scanpy/preprocessing/_scale.py	100.00% <100.00%> (+10.41%)	⬆️
... and 3 more