Enables the use of the `cookie.unencryptedCookies` config item to specify cookies that should not be passed through the cookie encryption middleware. Cookie configuration file added in https://github.com/octobercms/october/commit/ab9dcaf09c0ee40cbc0a2eae8a0555da0c01cfa0, documented in octobercms/docs#3644. Credit to @pikanji