Add constraint satisfaction problem solver

[arthurzam]

No description provided.

[codecov]

Codecov Report

Base: 58.67% // Head: 59.18% // Increases project coverage by +0.50% 🎉

Coverage data is based on head (5540046) compared to base (0ea0ab6).
Patch coverage: 96.66% of modified lines in pull request are covered.

❗ Current head 5540046 differs from pull request most recent head b73feaf. Consider uploading reports for the commit b73feaf to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #91      +/-   ##
==========================================
+ Coverage   58.67%   59.18%   +0.50%     
==========================================
  Files          57       58       +1     
  Lines        6679     6769      +90     
  Branches     1384     1410      +26     
==========================================
+ Hits         3919     4006      +87     
- Misses       2523     2524       +1     
- Partials      237      239       +2     

Impacted Files	Coverage Δ
src/snakeoil/constraints.py	96.66% <96.66%> (ø)

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