Adds Methods for Managing the DynamoDbClientService.
Adds Methods for Managing the DynamoDbClientService.

This commit adds some methods to allow for managing the
DynamoDbClientService which is being used by all the models.

zoul0813/laravel-dynamodb,baopham/laravel-dynamodb,zoul0813/laravel-dynamodb,baopham/laravel-dynamodb,baopham/laravel-dynamodb,zoul0813/laravel-dynamodb