Alan Cumming is on a mission to highlight “abuses happening at private zoos”. ‘The Traitors US’ host and actor, 59, who starred alongside male chimpanzee Tonka in the 1997 film ‘Buddy’, says he can “empathise” with the creatures – and now wants his new ‘Chimp Crazy’ HBO documentary to spotlight the chimp trade and the ill-treatment of the animals in captivity. He opened up to the New York Times about the project, which follows exotic animal broker Tonia Haddix as she is involved in a “years-long saga” involving her, Tonka, PETA and Alan – with the four-part series also focusing on private prim…