Salumi sampler for six? Check. Spaghetti alla carbonara? But of course. Maialino al forno, or suckling pig for two? That’s the $64 signature dish at Maialino, the hotly anticipated Danny Meyer & Co. show opening next week at the Gramercy Park Hotel. Here’s your first look at the hot-off-the-presses dinner menu, from zuppa to pine-nut tart.