Stephen M. Ross, who as former head of Related Cos. drove development of Time-Warner Center at Columbus Circle and Hudson Yards, is creating a new Boomtown USA far from Manhattan’s West Side — in West Palm Beach , a short bridge stroll across the Intracoastal Waterway from its wealthier cousin, Palm Beach Island. West Palm, long in the shadow of its glam neighbor, has emerged as a live-work-and play model for what Ross sees as a “new Silicon Valley.” A business-friendly political climate, sunny