Provide a variable to access the request information

Provide a variable, similar to response, which can make it easier to access the information about the request sent by Karate. The rationale is to make the request and response available to external Java classes accessed through Java Interop.

More details available on the StackOverflow question, https://stackoverflow.com/questions/46846367/accessing-the-built-request-details-in-karate/

[createam]

@ptrthomas Makes sense. Saw that you have already changed the name. Thanks for making this update.

[ptrthomas]

@createam great. actually I thought hard about it. each built-in variable adds bloat to the context, which becomes painful especially when doing a call to other features - since the return value is an aggregate of all variables. so considering that this is a 0.01 % use case (you are the first to request this) I felt this is better. plus it would be for those who are writing frameworks on top of karate like you are, and know what you are doing. the other consideration is it gets low-level, for e.g. the request body is held as a byte-array, which you need to deal with.

I’m thinking that karate.prevRequest might be a slightly better name, what do you think ?