[request]: Support serialization / deserialization of data structures (regression testing)

[jasonmccampbell]

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Tell us about your request
Support serialization and deserialization of Textract and other data structures returned as a result of queries to AWS services

Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?
For regression testing, I find it useful to cache Textract results to make sure they are being processed correctly for known documents. For this use case, it is useful to save the returned JSON and be able to deserialize it to the same data structures
which are returned from live calls.

Are you currently working around this issue?
I currently do this in Rusoto, it would be convenient to be able to deserialize saved JSON back to a GetDocumentAnalysisOutput structure. It looks like the existing serialization code is private and designed to work with HTTP responses.

If there is already an existing mechanism for this, please let me know.

Additional context
The library works really well - thank you!

Attachments
None

[rcoh]

Related: #199

Thanks for the request! We're going to investigate ways to enable different sorts of record/replay as well as mock client construction to address these use cases.