Add dynamodb storage support

https://aws.amazon.com/dynamodb
We need to have a space between every if statement and their parenthesis, i.e. `if (...) {`

But this would be better off as something more like this:

```php
$clientData = compact($client_id, $redirect_uri, $grant_types, $scope, $user_id);
$clientData = array_filter($clientData, function ($value) { return !is_null($value); });
```