std.Io.Threaded: implement netInterfaceName

[andrewrk]

Extracted from #25592.

fn netInterfaceName(userdata: ?*anyopaque, interface: net.Interface) net.Interface.NameError!net.Interface.Name {
 const t: *Threaded = @ptrCast(@alignCast(userdata));
 try t.checkCancel();

 if (native_os == .linux) {
 _ = interface;
 @panic("TODO implement netInterfaceName for linux");
 }

 if (native_os == .windows) {
 @panic("TODO implement netInterfaceName for windows");
 }

 if (builtin.link_libc) {
 @panic("TODO implement netInterfaceName for libc");
 }

 @panic("unimplemented");
}