feat: Add support for weighted edges

[bobluppes]

No description provided.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (59df926) 99.86% compared to head (44debdb) 99.87%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #31      +/-   ##
==========================================
+ Coverage   99.86%   99.87%   +0.01%     
==========================================
  Files          18       20       +2     
  Lines         755      828      +73     
==========================================
+ Hits          754      827      +73     
  Misses          1        1              

Impacted Files	Coverage Δ
include/graaflib/algorithm/shortest_path.h	100.00% <ø> (ø)
test/graaflib/graph_test.cpp	100.00% <ø> (ø)
include/graaflib/algorithm/graph_traversal.tpp	100.00% <100.00%> (ø)
include/graaflib/algorithm/shortest_path.tpp	96.87% <100.00%> (ø)
include/graaflib/directed_graph.tpp	100.00% <100.00%> (ø)
include/graaflib/graph.h	100.00% <100.00%> (ø)
include/graaflib/graph.tpp	100.00% <100.00%> (ø)
include/graaflib/io/dot.h	100.00% <100.00%> (ø)
include/graaflib/io/dot.tpp	100.00% <100.00%> (ø)
include/graaflib/properties/vertex_properties.tpp	100.00% <100.00%> (ø)
... and 5 more

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