“In the Heights,” originally slated to be released last June, arrives already engulfed with the aura of cultural event for one of the movies’ most blatantly underseen communities. And as a big-screen party, “In the Heights” is poised to rekindle the euphoric, dancing-the-aisles theatrical experience that’s been all but snuffed out over the past year. Just how much can “In the Heights” lift up? “It’s a lot,” Miranda sighs, “to put on a musical.” Yet the timing, despite Miranda’s early inclination to get the movie out by streaming last year, seems preordained. “In ...