Release times

[leonlan]

This PR:

• Closes Bring back support for release times #244.
• Adds and passes relevant tests.
• Has well-formatted code and documentation.

Notes:

• It is essential that you add a test when making code changes.
  This keeps the code coverage level up, and helps ensure the changes work as intended.
• When fixing a bug, you must add a test that would produce the bug in the master branch, and then show that it is fixed with the new code.
• New code additions must be well formatted. Changes should pass the pre-commit workflow, which you can set up locally using pre-commit.
• Docstring additions must render correctly, including escapes and LaTeX.

[codecov]

Codecov Report

Patch coverage: 95.00% and project coverage change: +0.02 🎉

Comparison is base (7533246) 93.98% compared to head (00d3d2d) 94.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #254      +/-   ##
==========================================
+ Coverage   93.98%   94.00%   +0.02%     
==========================================
  Files          63       63              
  Lines        2460     2469       +9     
  Branches      214      215       +1     
==========================================
+ Hits         2312     2321       +9     
+ Misses         49       48       -1     
- Partials       99      100       +1     

Impacted Files	Coverage Δ
pyvrp/Model.py	100.00% <ø> (ø)
pyvrp/cpp/ProblemData.h	100.00% <ø> (ø)
pyvrp/cpp/Solution.h	100.00% <ø> (ø)
pyvrp/cpp/Solution.cpp	91.20% <75.00%> (-0.42%)	⬇️
pyvrp/cpp/ProblemData.cpp	88.09% <100.00%> (+0.29%)	⬆️
pyvrp/cpp/TimeWindowSegment.h	100.00% <100.00%> (ø)
pyvrp/cpp/search/LocalSearch.cpp	89.36% <100.00%> (+0.04%)	⬆️
pyvrp/plotting/plot_route_schedule.py	96.10% <100.00%> (+1.04%)	⬆️
pyvrp/read.py	95.06% <100.00%> (+0.32%)	⬆️

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[leonlan]

Running a benchmark on VRPTW instances:

• AMD EPYC 7H12 (CPU passmark: 2014)
• 10 seeds per instance, 1 hour time limits

This branch 773db8c:

mean: 333349 (min: 333241, max: 333475)
mean gap: 0.50%

main 7533246:

mean: 333373 (min: 333212, max: 333496)
mean gap: 0.50%

Hardly any difference, so that's good news.

[N-Wouda]

Looks good to me. A few small comments, but nothing substantial.

[leonlan]

@N-Wouda I've implemented your comments. Performance is also OK (see #254 (comment)).

[N-Wouda]

LGTM!