After two years of sparse crowds in Times Square and other popular attractions, New York City is finally hoping for a robust rebound of visitors this year. But the city will still be missing a main driver of its prepandemic tourism boom: big spenders from China, whose government has yet to allow travel abroad. Before the pandemic, China was the fastest-growing source of foreign visitors to the city, with more than 1.1 million Chinese tourists arriving in 2019. Their impact on New York’s economy was supersized because they tended to…