Dump the Request object on `--debug` or `-vvv`

Codeception's console output (see https://github.com/Codeception/Codeception/issues/5977#issuecomment-694696510 for some examples) is misleading in that it suggests that there's an actual HTTP request being made, while in fact it's just a Symfony BrowserKit Request object that is passed to the framework's (front-)controller.

The actual content of this Request object isn't shown anywhere. I used `var_dump()` in my controller (!) for debugging.

So I'm suggesting to dump the Request object into the console if Codeception is called with the `--debug` or `-vvv` flag.