[DO NOT MERGE] 3D Delaunay impl

[imrn99]

I will do clean commits for this on another branch/PR, I'm opening this to have the diff online

[codecov-commenter]

Codecov Report

❌ Patch coverage is 2.63992% with 922 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.27%. Comparing base (0ffd41c) to head (40f0dd6).

Files with missing lines	Patch %	Lines
honeycomb-kernels/src/delaunay/mod.rs	0.00%	446 Missing ⚠️
honeycomb-kernels/src/cavity/mod.rs	0.00%	290 Missing ⚠️
honeycomb-core/src/cmap/builder/io.rs	0.00%	108 Missing ⚠️
honeycomb-kernels/src/utils/routines.rs	0.00%	77 Missing ⚠️
honeycomb-core/src/cmap/builder/structure.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #359      +/-   ##
==========================================
- Coverage   85.86%   79.27%   -6.59%     
==========================================
  Files          73       75       +2     
  Lines       10130    11075     +945     
==========================================
+ Hits         8698     8780      +82     
- Misses       1432     2295     +863     

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[imrn99]

closing in favor of a separate repo: https://github.com/imrn99/incremental-delaunay-honeycomb