Feat/autocorr obs

[michalk8]

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Description

Add attr option to :func:squidpy.gr.spatial_autocorr to select values from :attr:anndata.AnnData.obs or :attr:anndata.AnnData.obsm.

How has this been tested?

1 new test.

Closes

closes #653

[codecov-commenter]

Codecov Report

Merging #672 (a3fdef8) into main (21436bc) will decrease coverage by 0.01%.
The diff coverage is 84.21%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #672      +/-   ##
==========================================
- Coverage   78.56%   78.56%   -0.01%     
==========================================
  Files          31       31              
  Lines        4470     4492      +22     
  Branches      858      865       +7     
==========================================
+ Hits         3512     3529      +17     
- Misses        705      708       +3     
- Partials      253      255       +2     

Impacted Files	Coverage Δ
squidpy/gr/_ligrec.py	77.81% <ø> (ø)
squidpy/gr/_ppatterns.py	82.00% <81.81%> (-0.49%)	⬇️
squidpy/gr/_build.py	87.01% <100.00%> (ø)
squidpy/gr/_nhood.py	82.75% <100.00%> (ø)
squidpy/gr/_sepal.py	52.27% <100.00%> (ø)
squidpy/im/_container.py	85.42% <100.00%> (ø)
squidpy/pl/_utils.py	49.12% <100.00%> (ø)

[LLehner]

Thank you for the PR @michalk8. We think about removing towncrier and change how release notes are generated so I added them manually here.