Test benders cuts

[najaverzat]

In file benders_cuts.jl I create a formulation and I test with fixed (dumb) dual solutions that the cuts coefficients are well computed (in the case of a feasibility and an optimality cut). For the right-hand side, I test several cases ; when a variable has a upper/lower bound and also when there is an equality (but we have to check that last case, see issue #934)

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +8.30 🎉

Comparison is base (6c60415) 69.20% compared to head (beb79c2) 77.50%.

❗ Current head beb79c2 differs from pull request most recent head 53410f5. Consider uploading reports for the commit 53410f5 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #936      +/-   ##
==========================================
+ Coverage   69.20%   77.50%   +8.30%     
==========================================
  Files          83       79       -4     
  Lines        5877     5500     -377     
==========================================
+ Hits         4067     4263     +196     
+ Misses       1810     1237     -573     

Impacted Files	Coverage Δ
src/Algorithm/benders/default.jl	88.19% <100.00%> (+35.63%)	⬆️

... and 64 files with indirect coverage changes

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