feat: add success and fail notification plugins

- Allow `publish` plugins to return an `Object` with information related to the releases
- Add the `success` plugin hook, called when all `publish` are successful, receiving a list of release
- Add the `fail` plugin hook, called when an error happens at any point, receiving a list of errors
- Add detailed message for each error

lib/utils.js

@@ -0,0 +1,7 @@
+const {isFunction} = require('lodash');
+
+function extractErrors(err) {
+  return err && isFunction(err[Symbol.iterator]) ? [...err] : [err];
+}
+
+module.exports = {extractErrors};