autotune : parallel as default - STATUS_FAIL if nan - if GPUs no CPUs as default (#351)
autotune : parallel as default - STATUS_FAIL if nan - if GPUs no CPUs as default (#351)

* check status + small reformating

* black

* remove cleanup_decorator on hyperopt_worker

* default to 0 cpu workers if GPUs are found.

* fix log.

* default to parallel and call _cleanup_logger in _cleanup_decorator

YosefLab/scVI