Replace shortest_paths.hpp with dijkstra_shortest_paths.hpp

[pratzl]

New implementation includes a visitor.

[codecov]

Codecov Report

Attention: Patch coverage is 91.89189% with 6 lines in your changes missing coverage. Please review.

Project coverage is 91.04%. Comparing base (046ccb4) to head (f17df9c).
Report is 3 commits behind head on master.

Files	Patch %	Lines
...nclude/graph/algorithm/dijkstra_shortest_paths.hpp	93.93%	4 Missing ⚠️
tests/shortest_paths_tests.cpp	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #125      +/-   ##
==========================================
- Coverage   91.09%   91.04%   -0.06%     
==========================================
  Files          53       53              
  Lines        4202     4221      +19     
  Branches      371      371              
==========================================
+ Hits         3828     3843      +15     
- Misses        374      378       +4     

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