Add possibility to customize simulation dt

[Grufoony]

• Close Make dt of simulation configurable #312

[codecov]

Codecov Report

❌ Patch coverage is 87.85714% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.25%. Comparing base (501540c) to head (5af1c3a).

Files with missing lines	Patch %	Lines
src/dsf/mobility/TrafficSimulator.cpp	41.37%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #486      +/-   ##
==========================================
+ Coverage   86.09%   86.25%   +0.16%     
==========================================
  Files          54       54              
  Lines        7895     8004     +109     
  Branches      898      902       +4     
==========================================
+ Hits         6797     6904     +107     
- Misses       1085     1087       +2     
  Partials       13       13              

Flag	Coverage Δ
unittests	86.25% <87.85%> (+0.16%)	⬆️

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