feat(build): es2015 bundle artifact (#6291)

* es2015 bundle with dependencies via npm script build:es:bundle
* es2015 bundle without dependencies via npm script build:es:bundle
* jest dependency for test:artifact
* migrate babel.config.json to babel.config.js and maintain env support for commonjs and es2015
* remove polyfill
* fix es syntax: replace module.exports with export
* fix es syntax: remove .jsx extension inside import

.eslintrc

@@ -3,6 +3,7 @@ env:
   browser: true
   node: true
   es6: true
+  jest: true
 parserOptions:
   ecmaFeatures:
     jsx: true