Change behavior of None default metrics and allow results/plotting to work with bio/batch separately.

[adamgayoso]

Closes #157

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Codecov Report

Attention: Patch coverage is 76.47059% with 4 lines in your changes missing coverage. Please review.

Project coverage is 90.78%. Comparing base (a2575da) to head (88a747f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/scib_metrics/benchmark/_core.py	76.47%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #181      +/-   ##
==========================================
- Coverage   91.08%   90.78%   -0.30%     
==========================================
  Files          26       26              
  Lines         965      977      +12     
==========================================
+ Hits          879      887       +8     
- Misses         86       90       +4     

Files with missing lines	Coverage Δ
src/scib_metrics/benchmark/_core.py	96.36% <76.47%> (-2.33%)	⬇️