[benchmark][structured output] Add offline benchmark script for structured output

[lk-chen]

• Reuse some flags from serving version
• Tested that serving benchmark still work in V0
  • V1 serving benchmark is broken, but it was already broken on main branch
• Tested that offline benchmark work in V0/V1
• updated run_structured_ouput_benchmark.sh to allow config QPS_VALUES

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[mergify[bot]]

This pull request has merge conflicts that must be resolved before it can be merged. Please rebase the PR, @lk-chen.

https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork

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This pull request has been automatically marked as stale because it has not had any activity within 90 days. It will be automatically closed if no further activity occurs within 30 days. Leave a comment if you feel this pull request should remain open. Thank you!

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This pull request has been automatically closed due to inactivity. Please feel free to reopen if you intend to continue working on it. Thank you!