Add curve interpolation along mesh surface

[Sunderlandkyl]

Subtask of #4

Given the vertices closest to markup A and B, find the path betwen the two through the sulcus.

Can potentially use:
https://vtk.org/doc/nightly/html/classvtkDijkstraGraphGeodesicPath.html

If the surface mesh is not dense enough to provide a good curve using the algorithm, we can subdivide the mesh along the predicted path to generate a more accurate curve.

[sbouix]

Relevant paper done as part of NAMIC/Slicer many moons ago:
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10133/1/Sulci-segmentation-using-geometric-active-contours/10.1117/12.2249716.short?SSO=1

[Sunderlandkyl]

Curve path-finding on surface mesh has been implemented. See announcement here: https://discourse.slicer.org/t/new-feature-draw-curve-on-surface/10431.