UF: Adding the bin packing problem

[alejomonbar]

Description

I include the bin packing problem https://en.wikipedia.org/wiki/Bin_packing_problem in the list of problems. It comes with some new features such as classical_solution where it is used cplex to solve the problem and plot_solution where a string or dictionary is passed and it is plotted the solution.

Checklist

• [x] I have performed a self-review of my code.
• [x] I have commented my code and used numpy-style docstrings
• [x] 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?

Name the new unit-tests that you have added along with this change.

[codecov[bot]]

Codecov Report

Merging #201 (9b1bbdd) into dev (945ae3f) will decrease coverage by 8.84%. The diff coverage is 98.43%.

:exclamation: Current head 9b1bbdd differs from pull request most recent head 34d8e09. Consider uploading reports for the commit 34d8e09 to get more accurate results

@@            Coverage Diff             @@
##              dev     #201      +/-   ##
==========================================
- Coverage   97.72%   88.89%   -8.84%     
==========================================
  Files          37       32       -5     
  Lines        6771     5862     -909     
==========================================
- Hits         6617     5211    -1406     
- Misses        154      651     +497     

Impacted Files	Coverage Δ
tests/test_problems.py	99.07% <98.41%> (-0.09%)	:arrow_down:
tests/test_converters.py	100.00% <100.00%> (ø)

... and 17 files with indirect coverage changes

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