Added support for setting bodyParser limit param via environment variable (#1618)

In the NodeJs environment, the body-parser was set to 1MB, this change makes it configurable with an env variable.

examples/spec-example/nodejs-bodyParser-limit-example/hello/hello.js

@@ -0,0 +1,11 @@
+const process = require("process");
+
+module.exports = async function (context) {
+  let message =
+    "BODY_PARSER_LIMIT received from env variable " +
+    process.env.BODY_PARSER_LIMIT;
+  return {
+    status: 200,
+    body: message,
+  };
+};

examples/spec-example/nodejs-bodyParser-limit-example/hello/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "fission-nodejs-bodyParser-example",
+  "version": "0.1.0",
+  "author": "Rahul Bhati",
+  "contributors": [
+    {
+      "name": "Rahul Bhati",
+      "email": "rjbhati009@gmail.com"
+    }
+  ],
+  "description": "Nodejs example for setting bodyParser limit param via environment variable",
+  "engines": {
+    "node": ">=7.6.0"
+  },
+  "dependencies": {}
+}