[Benchmark] Allow oversample request in benchmark dataset

[JenZhao]

Enable oversample requests in HuggingFaceDataset, VisionArenaDataset and ShareGPTDataset.

This is mostly needed for small datasets like visionarena.

This branch

Dataset	Backend	Successful requests	Benchmark duration (s)	Total input tokens
hf-vision-arena	openai-chat	10000	444.00	627745
hf	openai-chat	10000	490.06	114223
sharegpt	vllm	10000	262.65	2205227

Main branch

Dataset	Backend	Successful requests	Benchmark duration (s)	Total input tokens
hf-vision-arena	openai-chat	500	36.29	33418
hf	openai-chat	10000	413.91	114223
sharegpt	vllm	10000	297.65	2205227

vllm serve Qwen/Qwen2-VL-7B-Instruct     --swap-space 16     --disable-log-requests

python3 vllm/benchmarks/benchmark_serving.py --model Qwen/Qwen2-VL-7B-Instruct --backend openai-chat --endpoint /v1/chat/completions --dataset-name hf --dataset-path lmarena-ai/vision-arena-bench-v0.1 --hf-split train --num-prompts 10000 --percentile-metrics ttft,tpot,e2el

python3 vllm/benchmarks/benchmark_serving.py --model Qwen/Qwen2-VL-7B-Instruct --backend openai-chat --endpoint /v1/chat/completions --dataset-name hf --dataset-path lmms-lab/LLaVA-OneVision-Data --hf-split train --hf-subset "chart2text(cauldron)" --num-prompts 10000 --percentile-metrics ttft,tpot,e2el

python3 vllm/benchmarks/benchmark_serving.py --backend vllm --model Qwen/Qwen2-VL-7B-Instruct --dataset-name sharegpt --dataset-path /home/jovyan/data/vllm_benchmark_datasets/ShareGPT_V3_unfiltered_cleaned_split.json --num-prompts 10000

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[ywang96]

Overall LGTM - left a small naming nit