Improve benchmark.sh (#8730)

Improve benchmark.sh (#8730)

Summary:
* Started on some proper usage text to document the options
* Added a `JOB_ID` parameter, so that we can trace jobs and relate them to other assets
* Now generates a correct TSV file of the summary
* Summary has new additional fields:
    * RocksDB Version
    * Date
    * Job ID
* db_bench log files now also include the Job ID

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8730

Reviewed By: mrambacher

Differential Revision: D30747344

Pulled By: jay-zhuang

fbshipit-source-id: 87eb78d20959b6d95804aebf129606fa9c71f407