WASHINGTON — An appeals court is deciding whether deputy U.S. marshals who shot and wounded a teenage driver eight years ago may be sued in federal court, a case that’s unfolding amid a national debate about police use of force and the legal protections afforded to law enforcement. The U.S. Court of Appeals for the District of Columbia Circuit heard arguments last month and could issue an opinion soon. The case of driver Michael Fenwick raises questions about how police can deal with fleeing individuals …