Primal-dual evolution event handler recipe

[Joao-Dionisio]

Based on #881, I think it's helpful to include the answer as a recipe.

It's a bit scuffed, I think one needs to capture the final state of the problem, as the event handler is not called when the solving stops.

I'm also unsure about the best way to separate things, I decided just to include the event handler in the recipe and the user would need to optimize the model themselves, as well as plot the solutions afterward. I'd be happy with better suggestions, though.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 35 lines in your changes missing coverage. Please review.

Project coverage is 53.99%. Comparing base (23e00b3) to head (53627d2).
Report is 81 commits behind head on master.

Files with missing lines	Patch %	Lines
src/pyscipopt/recipes/primal_dual_evolution.py	0.00%	35 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #916      +/-   ##
==========================================
+ Coverage   52.29%   53.99%   +1.70%     
==========================================
  Files          20       21       +1     
  Lines        3991     4380     +389     
==========================================
+ Hits         2087     2365     +278     
- Misses       1904     2015     +111     

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