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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Codecov Report

❌ Patch coverage is 96.82540% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.93%. Comparing base (a656a33) to head (dd09b9f).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/scanpy/get/get.py	94.11%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4333      +/-   ##
==========================================
- Coverage   81.98%   81.93%   -0.06%     
==========================================
  Files         134      134              
  Lines       13235    13028     -207     
==========================================
- Hits        10851    10674     -177     
+ Misses       2384     2354      -30     

Flag	Coverage Δ
hatch-test.low-vers	78.80% <84.12%> (-0.27%)	⬇️
hatch-test.pre	81.80% <96.82%> (-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)
src/scanpy/experimental/pp/_normalization.py	92.75% <100.00%> (-1.93%)	⬇️
src/scanpy/get/_aggregated.py	95.28% <100.00%> (+0.03%)	⬆️
src/scanpy/preprocessing/_docs.py	100.00% <100.00%> (ø)
src/scanpy/preprocessing/_highly_variable_genes.py	94.63% <ø> (ø)
src/scanpy/preprocessing/_pca/__init__.py	90.76% <100.00%> (-0.75%)	⬇️
src/scanpy/preprocessing/_scale.py	100.00% <100.00%> (+10.41%)	⬆️
src/scanpy/preprocessing/_simple.py	90.99% <100.00%> (ø)
... and 3 more