A driver was sentenced last week to 10 years in state prison for causing the death of a motorcyclist he hit with his car along an Edison highway in 2020, authorities said. Edison police officers responded to the deadly crash at 2:19 a.m. on June 27, 2020 on Route 1 North near Grandview Avenue and found 51-year-old Brooklyn resident Richard Diaz down in the roadway, according to a joint statement from the Middlesex County Prosecutor’s Office and the Edison Police Department. Diaz was taken to Robert Wood Johnson University Hospital in New Brunswick, where he died from his injuries three days la…