add layer argument for sc.tl.score_genes_cell_cycle

[shinthor]

Simple addition of the layer argument which is already included in sc.tl.score_genes so that you can use your own layer instead of being restricted to what is stored in adata.X

• Closes #
• Tests included or not required because:

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 76.52%. Comparing base (208115d) to head (4ed4477).

Additional details and impacted files

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##             main    #3138   +/-   ##
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  Coverage   76.52%   76.52%           
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  Files         109      109           
  Lines       12483    12483           
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  Hits         9553     9553           
  Misses       2930     2930           

Files	Coverage Δ
src/scanpy/tools/_score_genes.py	85.10% <0.00%> (ø)

[flying-sheep]

Looks good! Could you add a release note? This is a feature, so it would be in 1.11.0.md.

I wonder if it would be a good idea to do something like

s_name, g2m_name, phase_name = (
    f"{layer}_{name}" if layer else name for name in ("S_score", "G2M_score", "phase") 
)

and then use that, then multiple layers could be scored?