Create Copy Numbers (CNs) counts matrix from input data. This function has been derived from: https://github.com/UCL-Research-Department-of-Pathology/panConusig/blob/main/R/setup_CNsigs.R
getCNCounts(data)
A matrix with Copy Numbers (CNs) counts per patient.
data(cn_example_reduced)
res <- getCNCounts(data = cn_example_reduced)