Create a function in Utilities.cc that calculates distance from Ridge + Spreading velocity

[danieldouglas92]

Remove duplicate code in multiple places by creating a function in Utilities.cc that calculates the distance from a ridge and the spreading velocity. This is used by several different temperature plugins of various features. Currently, the spreading velocity is just a single, constant value, but this will be changed in a followup PR.

[MFraters]

Looks good. Could you just add some documentation to the function?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6f0e0a4) 93.40% compared to head (26092d1) 93.37%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #591      +/-   ##
==========================================
- Coverage   93.40%   93.37%   -0.03%     
==========================================
  Files          92       92              
  Lines        6349     6266      -83     
==========================================
- Hits         5930     5851      -79     
+ Misses        419      415       -4     

Files	Coverage Δ
...eanic_plate_models/temperature/half_space_model.cc	98.18% <100.00%> (+0.01%)	⬆️
...es/oceanic_plate_models/temperature/plate_model.cc	98.38% <100.00%> (+0.11%)	⬆️
...ucting_plate_models/temperature/mass_conserving.cc	98.01% <100.00%> (+0.54%)	⬆️
source/world_builder/utilities.cc	97.19% <100.00%> (+0.39%)	⬆️

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[github-actions]

Benchmark	Main	Feature	Difference (99.9% CI)
Slab interpolation simple none	0.969 ± 0.004 (s=477)	0.968 ± 0.004 (s=455)	-0.2% .. -0.0%
Slab interpolation curved simple none	0.976 ± 0.004 (s=471)	0.975 ± 0.004 (s=454)	-0.2% .. -0.0%
Spherical slab interpolation simple none	1.071 ± 0.006 (s=398)	1.069 ± 0.006 (s=446)	-0.3% .. -0.1%
Slab interpolation simple curved CMS	1.012 ± 0.004 (s=431)	1.011 ± 0.004 (s=461)	-0.2% .. -0.1%
Spherical slab interpolation simple CMS	1.332 ± 0.007 (s=366)	1.331 ± 0.008 (s=312)	-0.2% .. +0.0%
Spherical fault interpolation simple none	1.075 ± 0.006 (s=424)	1.072 ± 0.005 (s=417)	-0.3% .. -0.1%
Cartesian min max surface	2.164 ± 0.026 (s=214)	2.168 ± 0.022 (s=204)	-0.2% .. +0.6%
Spherical min max surface	6.922 ± 0.034 (s=70)	6.920 ± 0.037 (s=63)	-0.3% .. +0.3%