The cat is finally about to be out of the bag. Not that Cashmere Cat has exactly kept a clandestine profile, working as he has with so many of the top names in pop, R&B, and hip-hop, from Kanye West to Ariana Grande — a track record that’s threatened to make him a household name just as a producer. But as a recording artist in his own right, he’s taking off the wraps with the release of his first full-length album under his own nom de plume. The spring release sports guest appearances from a who