[feat] Implement custom inspect on sails.helpers (#7282)

* feat: implement custom inspect on sails.helpers

* Update .eslintrc

* Revert "feat: implement custom inspect on sails.helpers"

This reverts commit f35bf59.

* feat: implement inspect for helpers

---------

Author: DominusKelvin

.eslintrc

@@ -23,7 +23,8 @@
   },
 
   "globals": {
-    "Promise": true
+    "Promise": true,
+    "Symbol": true,
     // ^^Available since Node v4
   },
 

lib/hooks/helpers/index.js

@@ -148,7 +148,7 @@ module.exports = function(sails) {
       // > NOTE: This is NOT `sails.config.helpers`-- this is `sails.helpers`!
       // > (As for sails.config.helpers, it's set automatically based on our `defaults above)
       sails.helpers = {};
-      Object.defineProperty(sails.helpers, 'inspect', {
+      Object.defineProperty(sails.helpers, Symbol.for('nodejs.util.inspect.custom'), {
         enumerable: false,
         configurable: false,
         writable: true,