ThroughputBenchmark: improve formatting for ExecutionStats (#22293)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/22293
Just wrapping C class with nicer python interface which now
ust print dirrectly to get all the data. Later we can add various
visualizations there
Differential Revision: D16023999
fbshipit-source-id: 8436e37e36965821a690035617784dcdc352dcd1
