Add Conditional Randomization Test

[lionelkusch]

This PR is based on

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.73%. Comparing base (3ecce71) to head (d7832e9).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #359      +/-   ##
==========================================
+ Coverage   98.10%   99.73%   +1.62%     
==========================================
  Files          22       20       -2     
  Lines        1161     1120      -41     
==========================================
- Hits         1139     1117      -22     
+ Misses         22        3      -19     

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[bthirion]

I'm confused by the fact that this includes a big diff.
I made some comments specific to the CRT part.

[bthirion]

I don't understand whuy you take an absolute value here.

[lionelkusch]

I take the absolute value because there is no guarantee that the test_score is always positive or negative.
In consequence, taking the mean can give a value close to zeros just because there is a switch between positive and negative values, which is, for me, not a desirable behaviour.

[lionelkusch]

I'm confused by the fact that this includes a big diff. I made some comments specific to the CRT part.

You should read the description.
It's a draught PR based on 2 PR #366 and #361.
I didn't ask you to review it for the moment.