feat(massageConfiguration): Add data-transformation function

The meta-configuration structure imposes we change the way `react-hijack` parses and pulls its data. Because that work is both error-prone and also time-consuming, we chose to implement a function that would "massage" the data so it fits the current way react-hijack expects it.

app/javascript/src/componentLoader/massageConfiguration.js

@@ -0,0 +1,21 @@
+const massageConfiguration = (config, identifier) => {
+  const result = {
+    [identifier]: {}
+  };
+
+  Object.keys(config)
+    .forEach(
+      addon => Object.keys(config[addon])
+        .forEach(
+          component => {
+            if (config[addon][component].areas.indexOf(identifier) !== -1) {
+              result[identifier][component] = config[addon][component];
+            }
+          }
+        )
+    );
+
+    return result;
+};
+
+export default massageConfiguration;