Add v3 score field (#1538)
Summary:
Add v3 score field to the torch-nightly test.
Pull Request resolved: https://github.com/pytorch/benchmark/pull/1538
Test Plan:
```
$ python run_benchmark.py torch-nightly -c v3-cuda-tests.yaml --score ~/work/tb-v3/nightly/metrics-20230407145303.json
TorchBench score: 1000.0.
```
After changing the test latency to a larger value:
```
$ python run_benchmark.py torch-nightly -c v3-cuda-tests.yaml --score ~/work/tb-v3/nightly/metrics-20230407145303-larger.json
TorchBench score: 992.4067135827728.
```
After changing the test latency to a smaller value:
```
$ python run_benchmark.py torch-nightly -c v3-cuda-tests.yaml --score ~/work/tb-v3/nightly/metrics-20230407145303-smaller.json
TorchBench score: 1024.4664975604358.
```
Reviewed By: weiwangmeta
Differential Revision: D44794598
Pulled By: xuzhao9
fbshipit-source-id: 63a424cf9274a141c0d865d6e3a9e37212b9620c
