Adding faiss bench_fw to bento faiss kernel (#3531)

Summary:
Pull Request resolved: #3531

**In this diff**
1. I have add bench_fw to bento faiss kernel target
2. First part of notebook is changed to analyze sift1M results

Reviewed By: algoriddle

Differential Revision: D58823037

fbshipit-source-id: a67d4638af4368f0575bd289ce7aff8cf1fcd38b

Author: kuarora