UF: Adding the Maximal independent set (MIS) problem

[alejomonbar]

Adding the maximal independent set problem class with its corresponding test. https://en.wikipedia.org/wiki/Maximal_independent_set

Description

Adding the maximal independent set combinatorial optimization problem to the set of problems. This problem comes with the function classical_optimization which uses the docplex solver and plot_solution which plots the solution a given solution.

Checklist

• [x] I have performed a self-review of my code.
• [x] I have commented my code and used numpy-style docstrings
• [ ] I have made corresponding updates to the documentation.
• [x] My changes generate no new warnings
• [x] I have added/updated tests to make sure bugfix/feature works.
• [x] New and existing unit tests pass locally with my changes.

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

There is no new test but the test is inside test_problems

[codecov[bot]]

Codecov Report

Merging #208 (758ce84) into dev (945ae3f) will decrease coverage by 8.80%. The diff coverage is 100.00%.

:exclamation: Current head 758ce84 differs from pull request most recent head 627f432. Consider uploading reports for the commit 627f432 to get more accurate results

@@            Coverage Diff             @@
##              dev     #208      +/-   ##
==========================================
- Coverage   97.72%   88.93%   -8.80%     
==========================================
  Files          37       32       -5     
  Lines        6771     5874     -897     
==========================================
- Hits         6617     5224    -1393     
- Misses        154      650     +496     

Impacted Files	Coverage Δ
tests/test_problems.py	99.22% <100.00%> (+0.05%)	:arrow_up:

... and 16 files with indirect coverage changes

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