Implement SerDes.jsonType option for non-object internal types.

[robertjustjones]

The current SerDes assumes an object type on deserialization because the schema preprocessor hardcodes that jsonType. While arrays are objects in JS, they are distinct in JsonType so arrays will fail the object type check.

This PR adds an option to specify an alternative like "array" jsonType and passes it through in the preprocessor code. Included are an added test and doc update.

Thanks for the work on this functionality @pilerou and @cdimascio.

[robertjustjones]

I've since implemented a check for request data being a string before deserialization, removing skip that had been implemented if the incoming data was already of type object. Without this check, the above jsonType="array" would allow an array to be submitted instead of enforcing the string requirement in the API Spec.

You may want another option (strict?) for this check so I have PR'd it, but you can see the code and additional test here.

robertjustjones@60d34af

[cdimascio]

@robertjustjones this is great. thank you

[cdimascio]

@all-contributors add @robertjustjones for code and test

[allcontributors]

@cdimascio

I've put up a pull request to add @robertjustjones! 🎉

[robertjustjones]

Thanks @cdimascio!