596 Read graph without edges

[HenrZu]

Changes

Added an option to read a graph without edges. Especially useful for the create_graph_without_edges function.

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• Every addressed issue is linked (use the "Closes #ISSUE" keyword below)
• New code adheres to coding guidelines
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• Tests are added for new functionality and a local test run was successful
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Checks by code reviewer(s)

• Corresponding issue(s) is/are linked and addressed
• Code is clean of development artifacts (no deactivated or commented code lines, no debugging printouts, etc.)
• Appropriate unit tests have been added, CI passes and code coverage is acceptable (did not decrease)
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Additional context

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Closes #596

[codecov-commenter]

Codecov Report

Patch coverage: 76.47% and project coverage change: +0.12 🎉

Comparison is base (109766a) 93.07% compared to head (b114caf) 93.19%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #602      +/-   ##
==========================================
+ Coverage   93.07%   93.19%   +0.12%     
==========================================
  Files          93       93              
  Lines        7290     7291       +1     
==========================================
+ Hits         6785     6795      +10     
+ Misses        505      496       -9     

Impacted Files	Coverage Δ
cpp/memilio/io/mobility_io.h	87.09% <76.47%> (+0.21%)	⬆️

... and 2 files with indirect coverage changes

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