implement Laplace and Taubin smoothing

[imrn99]

Description

Scope: kernels / applications

Type of change: feat

Content description:

• implement a generic, weighted, vertex shifting function neighbor_based_smooth
• use that routine to implement Laplace and Taubin smoothing

Taubin smoothing: https://dl.acm.org/doi/10.1145/218380.218473

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 25 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.86%. Comparing base (964de80) to head (d57fbc2).

Files with missing lines	Patch %	Lines
honeycomb-kernels/src/remeshing/relaxation.rs	0.00%	25 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #394      +/-   ##
==========================================
- Coverage   85.97%   85.86%   -0.12%     
==========================================
  Files          75       75              
  Lines       10647    10661      +14     
==========================================
  Hits         9154     9154              
- Misses       1493     1507      +14     

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[cedricchevalier19]

LGTM