Charli XCX has always been on the cutting edge of things, constantly transversing and expanding the boundaries of pop and stardom, so it makes sense that she’s about to push her performances past a new kind of edge. On June 17, she — or, rather, a simulated version of her — will perform a concert in the metaverse, partnering with Samsung to play a show streaming exclusively on Roblox’s virtual-reality platform. But before she uploads her avatar to the cloud and takes to the pixelated…