[Improvement] Add more annotations or examples for bench cmd options

[nayutah]

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Add more annotations or examples for bench options

If this is a new function, please describe the motivation and goals.
--cluster='':
the cluster of database

--database='':
database name.

--driver='':   // list the supported database drivers
the driver of database

--extra-args=[]:  // give the example of extra arguments
extra arguments for benchmark

--host='': // give the example of host, ip or hostname or both ok ?
the host of database

[github-actions]

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