Theater lovers are very familiar with the beautiful and dazzling Mandy Gonzalez, who has graced the Broadway stage as Nina Rosario in “In The Heights,” Elphaba in “Wicked” and most recently spending two-and-a-half years as Angelica Schuyler in “Hamilton.” This week, Gonzalez will take a break from the Broadway phenomenon and lend her powerful vocal chops for the Kennedy Center’s …