Restoring one example as it is used in many places including Helm charts (#2011)

Some tests were pointing to examples directory which has been moved out. Also kept one node.js examples as it is widely used in Helm charts etc.

examples/nodejs/hello.js

@@ -0,0 +1,7 @@
+
+module.exports = async function(context) {
+    return {
+        status: 200,
+        body: "hello, world!\n"
+    };
+}