Allow to refer to files in mock definitions about smocker HOT 2 CLOSED

We also deal with very big payloads, and we usually just put them in the body. The mock file ends up big, but Smocker handles it just fine :)

Sometimes when we don't want to deal with very big mocks we have 2 solutions:

1. write the whole body on a single line. If the mock is not intended to be modified or read, it's ok
2. remove the useless parts from the body, and keep only the keys we use (whether it's JSON or XML)

But keep in mind, a mock file with a very big body should not be an issue for Smocker.

We don't really want to implement a reference to a file for 2 reasons:

1. we want the mocks to be self contained as much as possible. It's easier to maintain, to understand, and it helps us keep Smocker's code relatively simple
2. referencing an external file has its issues: where does the file come from? is it already loaded on Smocker via the persistence folder? is it loaded via another endpoint? this is not trivial to specify nor to implement, so I'd rather not implement something like this.

Is that ok for you?

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Basically, something like this: https://cloud.spring.io/spring-cloud-contract/reference/html/project-features.html#features-wiremock-using-files ...for WireMock.

Instead of body, could be bodyFile, or bodyFromFile, etc.

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