Add support for project stats with children flag

apiserver/schema/services/projects.conf

@@ -539,6 +539,13 @@ get_all_ex {
             description: "Scroll ID that can be used with the next calls to get_all to retrieve more data"
         }
     }
+    "999.0": ${get_all_ex."2.15"} {
+        response.properties.stats_with_children {
+            description: "If include_stats flag is set then this flag contols whether the child projects tasks are taken into statistics or not"
+            type: boolean
+            default: true
+        }
+    }
 }
 update {
     "2.1" {