A Jewish New Yorker described Tuesday how he was stabbed just centimeters from his heart by a hateful sicko — who made a chilling promise before lunging at him on a Brooklyn street. “I’m going to kill a Jew today,” the knife-wielding goon seethed before launching the antisemitic attack, said victim Elias Rosner, 35, in an interview with The Post on Wednesday. Rosner, a member of the Lubavitch Hasidic community in Crown Heights, had just left the temple on Tuesday afternoon when he came across the still-at-large attacker spewing antisemitic slurs. “I was waiting in a crowd of Jewish people...