Adding NodeJS version 12 env (#1683)

Co-authored-by: Rahul Bhati <rjbhati009@gmail.com>

test/tests/test_environments/node_src/test-case-3/wordCount.js

@@ -0,0 +1,8 @@
+module.exports = async function (context) {
+  var splitStringArray = context.request.split(" ");
+
+  return {
+    status: 200,
+    body: splitStringArray.length,
+  };
+};