core: debug pathfinding to find the shortest path

[eckter]

Fix #3319

• Fix a bug where the shortest path could have an invalid weight if the destination is on the same edge as the origin
• Use geodesy to compute geographic distances

[codecov]

Codecov Report

Merging #3334 (fbdc6db) into dev (b7081a7) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##                dev    #3334   +/-   ##
=========================================
  Coverage     68.21%   68.21%           
  Complexity     1897     1897           
=========================================
  Files           411      411           
  Lines         20441    20441           
  Branches       1513     1513           
=========================================
  Hits          13943    13943           
  Misses         5801     5801           
  Partials        697      697           

Flag	Coverage Δ
core	79.24% <100.00%> (ø)

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Impacted Files	Coverage Δ
.../fr/sncf/osrd/railjson/schema/geom/LineString.java	77.55% <ø> (ø)
.../java/fr/sncf/osrd/railjson/schema/geom/Point.java	16.66% <100.00%> (ø)
...ain/java/fr/sncf/osrd/utils/graph/Pathfinding.java	96.03% <100.00%> (ø)

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