A 9-year-old girl from Miami visiting the Big Apple with her mom was ‘sucker-punched’ in the head Monday while walking near Central Park — and a doorman at The Plaza made sure the assailant couldn’t flee before cops showed up. Suspect Raheem Ramsarran, 27, allegedly punched the young tourist in the left side of her head at around 11:20 a.m. on the corner of Central Park South and Grand Army Plaza, police sources said. “We saw a man with a backpack, a red hoodie and a beige jacket screaming at people and people literally running away from him and he...