[MAINT] Run sklearn check_estimators on PFI and PFICV

[jpaillard]

Related to #599
one more estimator from the list in #350

[codecov]

Codecov Report

❌ Patch coverage is 95.65217% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.20%. Comparing base (f75386e) to head (c14fbf0).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/hidimstat/base_perturbation.py	95.65%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #610      +/-   ##
==========================================
+ Coverage   98.06%   98.20%   +0.14%     
==========================================
  Files          23       23              
  Lines        1605     1619      +14     
==========================================
+ Hits         1574     1590      +16     
+ Misses         31       29       -2     

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[bthirion]

LGTM overall, thx.