Allow usage of array data from previous responses in Value()

[adiman9]

I found that I had a use case where I needed to take an id from an object that was part of an array in a response and use that id to test the next endpoint.

datalist: [
    {
       "id": "someId",
       "data": "some data"
    }
]

I then wanted to be able to do this inside the next request:

data:
   json:
      id: Value(myPreviousRequest.datalist[0].id)

This PR implements that functionality and allows for arbitrary nesting of arrays.

[jgroom33]

I think this already works with the following syntax: Value(myPreviousRequest.datalist.0.id)

[adiman9]

ahh ye, that would make sense actually. But it is really not the most intuitive way to having it work.

[jgroom33]

well, now both work 👍

[jgroom33]

disregard: <$ foo.bar.0.baz $> does not work <$ foo.bar[0]baz $> does not work <$ foo.bar[0]['baz'] $> does work <$ foo.bar[0].baz $> does work