Allow SQS messages larger than 192 KB

[istreeter]

For AWS pipelines using a SQS buffer, the limit for event size is 192 KB because this is the maximum allowed by SQS. This is unfortunate because Kinesis would allow events up to 1 MB.

This library allows support for much larger SQS messages, by using S3 as a backend. If collector uses the library for SQS messages, then the event limit can be raised to 1 MB in the kinesis collector.