sort out test properties "skipExample" such that request & response and multiple examples are accounted for.

[mattpolzin]

test properties currently just allow you to skip using the response example to validate response data or not.

• there needs to be a way to use a request example as request body or not (and validate that it matches the schema for the request).
• there needs to be a way to support multiple labeled examples instead of only supporting a single example.