Add async logging for root logger in runner

When adding async logging it was not possible to add for the root logger as the flake8 module that is called in `envoy.code.check` uses `multiprocessing.pool` and the threadsafe queue that is used by default, does not work for that situation

Its likely that using a multiprocessing.queue would fix the problem, at the expensive of some perf, so it may be desirable to use a queue according to whether debug logging is set