add "unchecked" versions of `Matrix::{vandermonde,from_vec_vec}` and test both matrices

changelog

• replace Matrix::vandermonde with Matrix::vandermonde_unchecked
• add a new Matrix::vandermonde which calls Matrix::vandermonde_unchecked after checking the seed points are distinct, otherwise, gives a KomodoError::InvalidVandermonde error
• same with Matrix::from_vec_vec and Matrix::from_vec_vec_unchecked
• add documentation tests for the two "checked" functions
• run the main lib tests on both a random and a Vandermond matrix, just to be sure we do not take advantage of the Vandermonde structure

added 3 commits

• bb798f49 - rename to `Matrix::vandermonde_unchecked`
• ccc746a0 - split `Matrix::from_vec_vec` into "unchecked"
• 92562823 - documentation

Compare with previous version

changed title from add Matrix::vandermonde{-_unsafe-} and test both matrices to add "unchecked" versions of Matrix::{+{+}vandermonde{+,from_vec_vec}+} and test both matrices

changed the description

enabled an automatic merge when the pipeline for 92562823 succeeds

merged

mentioned in commit 5dc7dd2c