Add universal obfuscation solution.

[aecorredor]

Right now, the library implements internal logging. Some of these logs include SQS records, which could potentially include private data (e.g. PHI). We need a universal solution for implementing obfuscation of all records, including from SQS, Kinesis, and Dynamo Streams. Right now, we've only implemented a solution for Dynamo Streams. We should try to extract that and implement it for the library as a whole.

More details: #59 (comment).