🐛 Add round-function to mitigate floating precision issues

[Drewniok]

Description

This PR adds std::round() to mitigate floating point errors.

Checklist:

• The pull request only contains commits that are related to it.
• I have added appropriate tests and documentation.
• I have made sure that all CI jobs on GitHub pass.
• The pull request introduces no new warnings and follows the project's style guidelines.

[github-actions]

clang-tidy review says "All clean, LGTM! 👍"

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (08b8676) 96.07% compared to head (b289113) 96.07%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #375   +/-   ##
=======================================
  Coverage   96.07%   96.07%           
=======================================
  Files         102      102           
  Lines       10133    10133           
=======================================
  Hits         9735     9735           
  Misses        398      398           

Files	Coverage Δ
.../algorithms/simulation/sidb/operational_domain.hpp	97.70% <100.00%> (ø)

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