Add refinement based on Geodesic distance

[hkjeldsberg]

• Add geodesic distance method (refinement) for constant (edge length) meshing
• Add test for geodesic distance meshing

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.66667% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 67.68%. Comparing base (298de3d) to head (ce03880). Report is 3 commits behind head on master.

Files	Patch %	Lines
tests/test_pre_processing.py	96.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #149 +/- ## =========================================== - Coverage 81.11% 67.68% -13.43% =========================================== Files 32 14 -18 Lines 3362 1176 -2186 =========================================== - Hits 2727 796 -1931 + Misses 635 380 -255 ```

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[hkjeldsberg]

@johannesring Forgot about this implementation (ref #132)

Implemented Geodesic distance meshing/refinement on this branch instead. Will merge soon.

Could be extended for diameter- and curvature-meshing if requested.