Add option to record AFNetworking

[Ashton-W]

AFNetworking posts notifications as request operations and session tasks are started and finish. We could add an option to setup the recorder to listen to all AFNetworking activity, without dealing with the underlying NSURLSession objects.

See: https://github.com/AFNetworking/AFNetworkActivityLogger

[johndpope]

Hi Ashton,

There is this AFNetworking library that records to HTTP Archive format.
https://github.com/mutualmobile/AFHARchiver

Seems like a bit of an oversight none of these libraries use this format to save data
https://gist.github.com/jjarava/5f26806bba75d052c41a

I opened this ticket for OHHTTPStubs to add support to this
AliSoftware/OHHTTPStubs#204
This library could also consider support this format.

And threw up this code to help assist this.
https://github.com/johndpope/har-reader