breaking-change: Separate concerns weightedness and directedness

[bobluppes]

This PR separates the concerns between weightedness of edges and directedness of graphs.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.01% ⚠️

Comparison is base (9a62679) 99.80% compared to head (b400021) 99.80%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #48      +/-   ##
==========================================
- Coverage   99.80%   99.80%   -0.01%     
==========================================
  Files          22       22              
  Lines        1025     1011      -14     
==========================================
- Hits         1023     1009      -14     
  Misses          2        2              

Files Changed	Coverage Δ
include/graaflib/algorithm/shortest_path.h	100.00% <ø> (ø)
include/graaflib/types.h	100.00% <ø> (ø)
test/graaflib/algorithm/cycle_detection_test.cpp	100.00% <ø> (ø)
test/graaflib/algorithm/graph_traversal_test.cpp	100.00% <ø> (ø)
test/graaflib/algorithm/shortest_path_test.cpp	100.00% <ø> (ø)
test/graaflib/graph_traits_test.cpp	100.00% <ø> (ø)
...est/graaflib/properties/vertex_properties_test.cpp	100.00% <ø> (ø)
include/graaflib/algorithm/cycle_detection.tpp	95.34% <100.00%> (ø)
include/graaflib/algorithm/graph_traversal.tpp	100.00% <100.00%> (ø)
include/graaflib/algorithm/shortest_path.tpp	100.00% <100.00%> (ø)
... and 12 more

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