Custom filterby

[nwlandry]

Added the ability for users to define their own functions of the form f(val, arg) to add flexibility to filterby and filterby_attr.

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.20%. Comparing base (4667614) to head (33612b0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #524      +/-   ##
==========================================
+ Coverage   92.05%   92.20%   +0.15%     
==========================================
  Files          60       60              
  Lines        4381     4389       +8     
==========================================
+ Hits         4033     4047      +14     
+ Misses        348      342       -6     

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[thomasrobiglio]

@nwlandry thanks, I will review this during the afternoon!

[thomasrobiglio]

I have only found to minor things in the new recipe (changes in the comments to the code + execute the cells so that we see the outputs). The rest looks good. Thank you!

[nwlandry]

Thanks so much, @thomasrobiglio, for the helpful review! I have made all the requested changes and I plan on merging once the tests all pass!