Implement Dump-on-Error alternative

[wmdietlGC]

One useful way of debugging Checker Framework issues was to pass -doe to javac, which "dumps-on-errors", meaning one sees a stack trace from where an error is raised.

The recent changes to collect all errors from a compilation unit and report them in BaseTypeChecker::printCollectedMessages 0c2c4f8 makes passing -doe useless, as all errors have the same stack trace.

It would be very useful for debugging if the CheckerMessage stored the stacktrace of where it was originally created and we either add a new -AdumpOnErrors flag (or reuse the existing -AprintErrorStack for this purpose) to output this additional information.