[refactor,#59][s]: move packages/portal => examples/catalog as per plan in #59.

What is currently packages/portal is example of a running portal and should move to examples (it will get replaced by an actual portal lib soon).

examples/catalog/components/resource/DataExplorer.tsx

@@ -0,0 +1,25 @@
+import { useQuery } from '@apollo/react-hooks';
+import { ErrorMessage } from '../_shared';
+import { GET_RESOURCES_QUERY } from '../../graphql/queries';
+
+const DataExplorer: React.FC<{ variables: any }> = ({ variables }) => {
+  const { loading, error, data } = useQuery(GET_RESOURCES_QUERY, {
+    variables,
+    // Setting this value to true will make the component rerender when
+    // the "networkStatus" changes, so we are able to know if it is fetching
+    // more data
+    notifyOnNetworkStatusChange: true,
+  });
+
+  if (error) return <ErrorMessage message="Error loading dataset." />;
+  if (loading) return <div>Loading</div>;
+
+  const { result } = data.dataset;
+  const resource = result.resources.find(
+    (item) => item.name === variables.resource
+  );
+
+  return <>{JSON.stringify(resource)}</>;
+};
+
+export default DataExplorer;