Function gets input gene's gnomAD Synonymous Z-Score, Non-Synonymous Z-Score, and PLI Score
from data retrieved from gnomAD. If there is no gene name information in the input,
gnomad_scores finds the genes that related with input PDB chain ID by using a dataset retrieved from Ensembl.
If there are multiple genes annotated for same PDB, gnomad_scores function gets the gene that has the maximum Synonymous Z-Score, Non-Synonymous Z-Score, and pLI Score.