Add exportTrafficLights function

[Grufoony]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 91.01124% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.01%. Comparing base (bf73174) to head (8ab5f9e).

Files with missing lines	Patch %	Lines
src/dsf/mobility/RoadNetwork.cpp	84.00%	4 Missing ⚠️
test/mobility/Test_graph.cpp	93.75%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #500      +/-   ##
==========================================
+ Coverage   83.94%   84.01%   +0.07%     
==========================================
  Files          54       54              
  Lines        8396     8485      +89     
  Branches      999     1007       +8     
==========================================
+ Hits         7048     7129      +81     
- Misses       1333     1339       +6     
- Partials       15       17       +2     

Flag	Coverage Δ
unittests	84.01% <91.01%> (+0.07%)	⬆️

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