Julia Garner and Anthony Boyle are promoting their biographical drama limited series “The Altruists,” which chronicles the rise and fall of the cryptocurrency exchange FTX. “Extra” spoke with Julia and Anthony about the film’s focus on the relationship between Sam Bankman-Fried and Caroline Ellison. Julia went through a physical transformation to play Caroline, but also had to rewire herself mentally. She explained, “She’s so complex... It’s v…