Add Status Codes to Exceptions / New Exception types

[USMCFighter94]

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Feature Request

Currently, when a user backs out of the Twitter login flow, the failure method in com.twitter.sdk.android.core.Callback is called, with a TwitterException, that contains a message saying that the user cancelled. Thus, if an application using Twitter login wishes to perform a different action for cancelling vs. auth failure, an un-pretty string check of the exception message is required e.g. twitterException.message?.toLowerCase()?.contains("request was canceled").

It would be nice if status codes could be used for the different states, or if a different exception was returned for cancellations, something like TwitterAuthCancelledException. This way string parsing and checking isn't required, and client code can be more readable.

[andypiper]

This repository is due for retirement on 31st October 2018 per the deprecation announcement, and no further updates are planned.