RACHEL SAVAGE NEW Zealand weightlifter Laurel Hubbard will become the first openly transgender athlete to compete at the Olympics after being selected for the women's super-heavyweight 87+kg category at the Tokyo Games next month. Hubbard's selection is fuelling a fierce global debate about whether trans women should be allowed to compete in women's sporting events, and - if they are - what the rules should be. Trans rights campaigners say excluding trans athletes is discriminatory and will stoke bias against trans people in general, but critics say trans women athletes have an unfair physical advantage in women's competitions. The issue…