(Reuters) - The founder of WikiLeaks, Julian Assange, on Monday was given the chance to challenge at Britain's highest court a decision allowing him to be extradited to America to face 18 criminal charges including breaking a spying law. American authorities want Australian-born Mr. Assange, 50, currently in jail in London as he awaits a ruling on his extradition, to face trial on 18 counts relating to WikiLeaks' release of vast troves of confidential American military records and diplomatic...