feat: allow use_graph and neighbors_key for metrics

[flying-sheep]

• Closes #
• Tests included or not required because:

• Release notes not necessary because:

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.92%. Comparing base (c4cbb22) to head (cb4f551).
⚠️ Report is 49 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3898      +/-   ##
==========================================
+ Coverage   76.82%   76.92%   +0.09%     
==========================================
  Files         116      116              
  Lines       12398    12407       +9     
==========================================
+ Hits         9525     9544      +19     
+ Misses       2873     2863      -10     

Flag	Coverage Δ
hatch-test.pre	76.92% <100.00%> (+0.09%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/scanpy/metrics/_common.py	94.73% <100.00%> (+4.32%)	⬆️
src/scanpy/metrics/_gearys_c.py	100.00% <100.00%> (ø)
src/scanpy/metrics/_morans_i.py	100.00% <100.00%> (ø)
src/scanpy/neighbors/_doc.py	100.00% <100.00%> (ø)
src/scanpy/plotting/_docs.py	100.00% <100.00%> (ø)
src/scanpy/preprocessing/_highly_variable_genes.py	95.03% <ø> (+0.31%)	⬆️

... and 2 files with indirect coverage changes

[ilan-gold]

Is the title correct for this PR? An issue for it? It looks good just confused, not sure I'm totally clear