[Feature] Update benchmark_throughput.py to support image input

[lk-chen]

Update benchmark_throughput to support image input. Tested with ShareGPT4V

on top of #9779 to tackle #9778

Tested with

# Download GPT4V dataset according to README, then
python vllm/benchmarks/benchmark_throughput.py \
    --model mistral-community/pixtral-12b \
    --max-model-len=8192 \
    --dataset sharegpt4v_instruct_gpt4-vision_cap100k.json

FIX #9778

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[github-actions]

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[comaniac]

Otherwise LGTM. cc @ywang96 @DarkLight1337

[mergify]

This pull request has merge conflicts that must be resolved before it can be
merged. @lk-chen please rebase it. https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork

[mergify]

This pull request has merge conflicts that must be resolved before it can be
merged. @lk-chen please rebase it. https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/syncing-a-fork

[comaniac]

Overall LGTM. cc @ywang96 @DarkLight1337

[DarkLight1337]

Should be ok then. Thanks for adding this!