PHILADELPHIA — A group of more than 100 former and current prosecutors and law enforcement officials is calling on President Joe Biden to prioritize criminal justice reform and make good on his campaign promise to form a task force to evaluate how criminal cases are prosecuted in the U.S.The group, which included state attorneys general, police chiefs and former federal justice officials, sent a letter to the Biden administration Tuesday asking that a task force on 21st century prosecution be convened by the end of the …