Es6 modules support

[Zain-ul-din]

So far @randoms-pkg/code-generator is only generating files that have commonjs imports.

There are several options we could support:

• Es6 modules imports.
• Add an Optional field type that will describe the modules type.

Example

 # Es6 module
 import _ from 'path';

 # commonjs
 const _ = require ('path');

 "type": "commonjs" | "module"