transform_snp
is a function that transforms a SNP into a matrix for binomial naive bayes.
A string of a SNP
The number of classes for the binomial naive bayes, default to 1 - bernoulli, 2 - binomial (support heterozygous SNPs)
Existing transformation levels, if not provided, it will be inferred from the SNP
What to return, either "levels" or "transformed", or both
A vector of either the transformation levels or the transformed SNP or a list containing both