[Static Runtime] Support recordio format input for benchmark (#67530)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/67530
Currently `ptvsc2_predictor_bench` only uses the first input of a given recordio file even when the record io file contains many inputs.
This change extends `StaticRuntime::benchmark` to accept multiple input entries so that we can benchmark more extensibly and realistically using all the inputs in the recordio file.
Test Plan:
Tested `ptvsc2_predictor_bench` with / without this change executing the following command:
```
MKL_NUM_THREADS=1 OMP_NUM_THREADS=1 numactl -m 0 -C 3 ./buck-out/opt/gen/caffe2/caffe2/fb/predictor/ptvsc2_predictor_bench --scripted_model=/home/djang/ads/adfinder/ctr_mobilefeed/302008423/302008423_0.predictor.disagg.local --recordio_inputs=/home/djang/ads/adfinder/ctr_mobilefeed/302008423/302008423.local.inputs.recordio --pt_enable_static_runtime=1 --compare_results=0 --iters=1 --warmup_iters=1 --num_threads=1 --do_profile=1 --method_name=local.forward --set_compatibility --do_benchmark=1 --recordio_use_ivalue_format=1
```
Reviewed By: hlu1
Differential Revision: D31947382
fbshipit-source-id: 4188271613aad201f8cad5f566e0dfed26680968
