Enable strict adherence to expected cell types

[Marius1311]

Optionally, try forcing the model to adhere to expected cell types. Can help to make results more consistent across samples, if only few known cell types are present.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.85%. Comparing base (9d3330d) to head (3157016).
Report is 32 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
+ Coverage   85.26%   85.85%   +0.59%     
==========================================
  Files           9        9              
  Lines         475      495      +20     
==========================================
+ Hits          405      425      +20     
  Misses         70       70              

Files with missing lines	Coverage Δ
src/cell_annotator/_prompts.py	100.00% <100.00%> (ø)
src/cell_annotator/base_annotator.py	100.00% <100.00%> (ø)
src/cell_annotator/cell_annotator.py	86.71% <100.00%> (-0.28%)	⬇️
src/cell_annotator/sample_annotator.py	81.48% <100.00%> (-0.17%)	⬇️

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