If you don’t know that pizza is one of the hottest trends in the food world, then where have you been? In New York City, a place hardly lacking for good pizza pies, several artisan pizzerias recently opened. During my trip there last week, my goal was to try a slice at each. On my list: Motorino, Keste´, Co. and Pulino. First up, Keste´ Pizza & Vino. It’s in a cramped and narrow space on Bleecker Street in the West Village. No reservations; put your name in and wait. On a Monday night, it was only 10 minutes. You are practically sitting in your neighbor’s lap — tables are crammed in every nook and cranny. No matter, the aroma of pizza baking is more than enough to make it worth your while to stay. You get Neapolitan-style pizzas here. In fact, Keste´ is the US headquarters for the Associazione Pizzaiuoli…