Making use of service resource over the low level client for SQS

[hjpotter92]

https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/sqs.html#service-resource

The resource objects are lazily loaded. No need for an extra API call.

https://stackoverflow.com/a/48867829/1190388

[hjpotter92]

@jegesh If you want, I can start working on this. It'd be useful for my organisation as well.