⚡ Made distance functions constexpr

[marcelwa]

Added missing constexpr

[codecov]

Codecov Report

Merging #85 (f3a945f) into main (6e26956) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #85   +/-   ##
=======================================
  Coverage   93.63%   93.63%           
=======================================
  Files          58       58           
  Lines        6083     6083           
=======================================
  Hits         5696     5696           
  Misses        387      387           

Impacted Files	Coverage Δ
...clude/fiction/algorithms/path_finding/distance.hpp	100.00% <100.00%> (ø)

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[github-actions]

clang-tidy review says "All clean, LGTM! 👍"