Cut selection flags for write and read cuts functions

[Thuener]

Related with #778, this PR adds:

• cut_selection flag to use or not the cut selection algorithm when reading the files: This will significantly reduce the time to load a file
• write_only_selected_cuts to write only the selected cuts: This will reduce the file size and reading time significantly

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 93.35%. Comparing base (d2495d6) to head (0e25ac5).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/plugins/bellman_functions.jl	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #781      +/-   ##
==========================================
- Coverage   93.40%   93.35%   -0.05%     
==========================================
  Files          27       27              
  Lines        3486     3490       +4     
==========================================
+ Hits         3256     3258       +2     
- Misses        230      232       +2     

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[odow]

I'm happy if you're happy. You should have permission to merge.

We're missing a test, but I'm not too worried about that.

[Thuener]

I can create the tests. Any recommendation?
Just write and read and calculate the bound is enough?