Add PYI lints

[flying-sheep]

See scverse/anndata#1241

[codecov]

Codecov Report

Attention: Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.

Project coverage is 77.24%. Comparing base (0d04447) to head (41666cf).
Report is 46 commits behind head on main.

Files with missing lines	Patch %	Lines
src/scanpy/_utils/__init__.py	62.50%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3339   +/-   ##
=======================================
  Coverage   77.23%   77.24%           
=======================================
  Files         111      111           
  Lines       12608    12609    +1     
=======================================
+ Hits         9738     9740    +2     
+ Misses       2870     2869    -1     

Files with missing lines	Coverage Δ
src/scanpy/_settings.py	90.20% <100.00%> (ø)
src/scanpy/cli.py	93.75% <100.00%> (ø)
src/scanpy/get/_aggregated.py	95.23% <100.00%> (ø)
src/scanpy/plotting/_anndata.py	85.56% <ø> (ø)
src/scanpy/plotting/_stacked_violin.py	86.40% <ø> (ø)
src/scanpy/plotting/_tools/__init__.py	78.22% <ø> (ø)
src/scanpy/plotting/_tools/paga.py	68.47% <ø> (ø)
src/scanpy/plotting/_tools/scatterplots.py	86.69% <ø> (ø)
src/scanpy/preprocessing/_scale.py	91.89% <ø> (ø)
src/scanpy/preprocessing/_scrublet/sparse_utils.py	89.28% <ø> (ø)
... and 4 more