Across ethnically rich New York, you can easily dine on food from 100-plus countries. Or you can just go to the borough of Queens, where an incredibly diverse food scene is thriving even in these pandemic days. Located across the East River from Manhattan, Queens has benefited from steady immigration that has built up a fabulously varied culinary stage. “Of the five boroughs, Queens is the one with the most diverse population… with over 100 ethnicities, by my count,” said Robert Sietsema, a food writer for Eater.com. He said nobody knows the exact number of communities, as immigrants keep c…