Approaching 40, Esteban Cortázar has come full circle. South Beach’s famed wunderkind who hobnobbed with Gianni Versace, Madonna and ’90s supermodels is rediscovering his roots after spending 16 years in Paris. Living among New York, his native Colombia and South Beach, he’s designing costumes for Miami City Ballet’s “Sentimiento,” a commissioned work choreographed by Durante Verzola that premieres at Miami’s Arsht Center on…