By Andrew Chung and John Kruzel WASHINGTON (Reuters) -U.S. Supreme Court justices on Tuesday grappled with thorny questions of sovereign immunity as they weighed a bid by Turkey’s state-owned lender Halkbank to avoid criminal charges in the United States for allegedly helping Iran evade American economic sanctions. The nine justices heard arguments in Halkbank’s appeal of a lower court’s ruling in favor of the U.S. government that allowed the prosecution of the bank to proceed. The case tests Halkbank’s contention that it is shielded from prosecution because, as an entity majority owned by the…