Analytics: track challenge and task events (#9885)

* feat(analytics): track challenge and task events

* feat(analytics): add more challenge events
Also tweaks data for better troubleshooting utility

* refactor(analytics): include IDs for challenges/groups

* refactor(analytics): term for award challenge is "close"

website/server/controllers/api-v3/tasks/groups.js

@@ -58,6 +58,16 @@ api.createGroupTasks = {
     let tasks = await createTasks(req, res, {user, group});
 
     res.respond(201, tasks.length === 1 ? tasks[0] : tasks);
+
+    tasks.forEach((task) => {
+      res.analytics.track('task create', {
+        uuid: user._id,
+        hitType: 'event',
+        category: 'behavior',
+        taskType: task.type,
+        groupID: group._id,
+      });
+    });
   },
 };