Work in progress: Significance threshold.

[LuisHeinzlmeier]

PR Checklist

• Referenced issue is linked
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

Description of changes

Technical details

Additional context

[codecov-commenter]

Codecov Report

❌ Patch coverage is 42.85714% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.81%. Comparing base (12897e1) to head (7612986).
⚠️ Report is 60 commits behind head on main.

Files with missing lines	Patch %	Lines
pertpy/tools/_enrichment.py	42.85%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #974      +/-   ##
==========================================
- Coverage   73.54%   71.81%   -1.73%     
==========================================
  Files          48       48              
  Lines        5613     5737     +124     
==========================================
- Hits         4128     4120       -8     
- Misses       1485     1617     +132     

Files with missing lines	Coverage Δ
...ertpy/tools/_differential_gene_expression/_base.py	90.24% <ø> (+1.21%)	⬆️
pertpy/tools/_enrichment.py	64.46% <42.85%> (-1.63%)	⬇️

... and 7 files with indirect coverage changes

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[LuisHeinzlmeier]

@Zethson, this is still work in progress for #967, but before I try to harmonize all threshold naming:

• Are you happy with the names?
• Are you happy with how I handle backward compatibility?

[Zethson]

2x yes. But you may also introduce scverse-misc and use https://scverse-misc.readthedocs.io/stable/generated/scverse_misc.deprecated_arg.html