feat(kernels): implement skewness computing routines

[imrn99]

Description

Scope: kernels

Type of change: feat

Content description: add a module with 2 new function to the kernel crate

• each function takes a map as an input and compute the skewness of its cell
  • the 2-map function, compute_cell_skewness_2d computes face skewness
  • the 3-map function, compute_cell_skewness_3d computes face or volume skewness depending on the value of a const argument N: u8. Volume computation is currently unimplemented as I could not find a reliable definition for unstructured meshes

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 48.18182% with 57 lines in your changes missing coverage. Please review.

Project coverage is 84.97%. Comparing base (578d9c2) to head (671445b).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
honeycomb-kernels/src/skewness/mod.rs	44.66%	57 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #287      +/-   ##
==========================================
- Coverage   85.41%   84.97%   -0.44%     
==========================================
  Files          63       65       +2     
  Lines        9257     9367     +110     
==========================================
+ Hits         7907     7960      +53     
- Misses       1350     1407      +57     

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[cedricchevalier19]

Is it possible to have the same name to compute cell skewness depending on the dimension of the cell?

Also, what about the capability to compute this skewness only for one cell?

I wonder if this iterator way of doing things is such a great idea; for example, we might want to compute this only on a part of the CMap, which we could, as a user, filter in advance.

[cedricchevalier19]

Can't this use the compute_cells_skewness_2d?