Add option `none` to disable all metrics (#1565)
Summary:
CPU and GPU peak memory consumption measurements are enabled by default, but we don't provide an option to disable them. By this PR, torchbench will check if `--metrics` includes `none`. If so, all metrics will be removed.
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1565
Reviewed By: aaronenyeshi
Differential Revision: D45206149
Pulled By: xuzhao9
fbshipit-source-id: 4479fe77cc0ff4678058ffd7ec0561e14c1a5e84
