Add Formula class

[tomicapretto]

This PR adds a new class called Formula. It closes #423. I have added tests. This class is not used within the Model class yet. That's going to come in a different PR.

[codecov-commenter]

Codecov Report

Merging #585 (2116150) into main (c74fb3d) will increase coverage by 0.23%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #585      +/-   ##
==========================================
+ Coverage   85.48%   85.72%   +0.23%     
==========================================
  Files          36       38       +2     
  Lines        2859     2914      +55     
==========================================
+ Hits         2444     2498      +54     
- Misses        415      416       +1     

Impacted Files	Coverage Δ
bambi/formula.py	100.00% <100.00%> (ø)
bambi/tests/test_formula.py	100.00% <100.00%> (ø)
bambi/tests/test_built_models.py	96.08% <0.00%> (-0.31%)	⬇️

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[zwelitunyiswa]

This PR adds a new class called Formula. It closes #423. I have added tests. This class is not used within the Model class yet. That's going to come in a different PR.

Very cool! I have played with this in brms and it's incredibly powerful. Can I try it out on the dev branch of Bambi?

[canyon289]

❤️

[tomicapretto]

This PR adds a new class called Formula. It closes #423. I have added tests. This class is not used within the Model class yet. That's going to come in a different PR.

Very cool! I have played with this in brms and it's incredibly powerful. Can I try it out on the dev branch of Bambi?

This is not going to have any effect in the meantime. I'm working in another branch to incorporate distributional models in Bambi. Stay tuned :)

[zwelitunyiswa]

Cool. Cheers, mate.