Making task endpoint a bit more useful, including state changes and attempts

libdaggy/include/daggy/Serialization.hpp

@@ -41,6 +41,8 @@ namespace daggy {
 
   std::string tasksToJSON(const TaskSet &tasks);
 
+  std::string taskRecordToJSON(const loggers::dag_run::TaskRecord &taskRecord);
+
   // Full specs
   DAGSpec dagFromJSON(const rj::Value &spec);
   DAGSpec dagFromJSON(const std::string &jsonSpec);