feat(exports): defined an exports map to make this a true dual-package

BREAKING CHANGE: an exports map has been defined for the package, which further restricts access to
files published with the package

Author: travi

example.js

@@ -2,7 +2,7 @@
 // remark-usage-ignore-next
 import stubbedFs from 'mock-fs';
 import {packageManagers} from '@form8ion/javascript-core';
-import {scaffold, test, lift} from './lib/index.cjs';
+import {scaffold, test, lift} from './lib/index.js';
 
 // remark-usage-ignore-next
 stubbedFs({'package.json': JSON.stringify({version: '0.0.0-semantically-released'})});