Add exportNodes and exportEdges functions in Graph class. Handle geometry attribute in Edge class.

[Grufoony]

No description provided.

[github-advanced-security]

Cppcheck (reported by Codacy) found more than 20 potential problems in the proposed changes. Check the Files changed tab for more details.

[codecov]

Codecov Report

Attention: Patch coverage is 84.52381% with 26 lines in your changes missing coverage. Please review.

Project coverage is 90.63%. Comparing base (1848e83) to head (e218f6a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/dsm/sources/Graph.cpp	69.23%	24 Missing ⚠️
src/dsm/sources/Road.cpp	50.00%	1 Missing ⚠️
src/dsm/sources/Street.cpp	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #269      +/-   ##
==========================================
- Coverage   90.90%   90.63%   -0.27%     
==========================================
  Files          35       35              
  Lines        5011     5082      +71     
  Branches      462      462              
==========================================
+ Hits         4555     4606      +51     
- Misses        456      476      +20     

Flag	Coverage Δ
unittests	90.63% <84.52%> (-0.27%)	⬇️

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