Migrations: enlarge columns for encrypted values
Migrations: additional fields to clients table
Adding OAuthUtility class

Currently, this class implements the shortcut for [en|de]cryption
methods. In the future, this class would be used for the oauth-php
interface implementations.
Add config to encrypt secrets instead of hashing
Use Security::hash() since OAuthComponent::hash() is deprecated
ClientsShell for creating/listing client records

Easier to test/list clients records