A former teacher at a Central Jersey middle school has been charged with the sexual assault of a student, officials said. Jeffrey Munguia, 32, of North Bergen, is accused of sexually assaulting a Carteret Middle School student in 2022, the Middlesex County Prosecutor’s Office said in a news release. Munguia was working at the school and was the victim’s teacher when the alleged assault occurred, authorities said. Prosecutors said he no longer works at the school, but his current employment status was not clear. He was arrested on Wednesday on charges of sexual assault and endangering the welfa…