add factory MIP example - take 2

[Crghilardi]

this is #1948 cleaned up and submitted as a branch rather than on master.

Tested locally and passes 93/93 with julia --project=examples examples/run_examples.jl

[codecov]

Codecov Report

Merging #2366 (8c3bcbc) into master (352f2c1) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2366   +/-   ##
=======================================
  Coverage   91.71%   91.71%           
=======================================
  Files          42       42           
  Lines        4440     4440           
=======================================
  Hits         4072     4072           
  Misses        368      368           

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[odow]

Looks like there are some issues with printing constraints in Latex form with Literate/Documenter. I've reverted to a function for now.

[blegat]

Looks like there are some issues with printing constraints in Latex form with Literate/Documenter.

This was fixed in JuliaDocs/Documenter.jl#1426 which will be included in Documenter v0.26, for SumOfSquares, I am checking out this branch of Documenter in the docs build to have the fix.