query reusability by QueryJob

QueryJob.task External Data Support
Query task is now pure function
Query.data is non-nullable (even the type)

packages/example/lib/another_component.dart

@@ -6,7 +6,7 @@ class AnotherComponent extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final lol = QueryBowl.of(context).getQuery<String>("greetings");
+    final lol = QueryBowl.of(context).getQuery<String, void>("greetings");
     if (lol?.data == null) return const CircularProgressIndicator();
     return Text("${lol!.data!} from AnotherComponent");
   }