Cutting-planes with quadrature weights for InfGDP

[dnguyen227]

This PR adds the use of quadrature weights when making cuts on InfGDP problems. This makes set_separation_objective a public function in order to modify the problem and keep it consistent with the cut to be generated. Workflow is largely the same.

[codecov]

Codecov Report

❌ Patch coverage is 80.95238% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 98.77%. Comparing base (a4ebe8a) to head (00e6604).

Files with missing lines	Patch %	Lines
ext/InfiniteDisjunctiveProgramming.jl	80.48%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #142      +/-   ##
==========================================
- Coverage   99.51%   98.77%   -0.74%     
==========================================
  Files          17       17              
  Lines        2061     2128      +67     
==========================================
+ Hits         2051     2102      +51     
- Misses         10       26      +16     

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