Fallback mock should use property example values before random values

[yoshutch]

If in the OAS document there is no example response, but the response has a schema that includes properties that have an example value, then the fallback mocking mechanism should return a mocked response what includes the provided example of that property. If no example value exists for the property then return a random value as it currently is.

This isn't super important, so not high on priority, but a nice-to-have.