switch to using upstream vllm with new metric

[coolkp]

• switch to using upstream vllm with new metric
• use latest series in gauge metric vllm:lora_requests_info using the time value of the series
• Use label pair running_lora_adapters
• update vllm example deployment to use latest
  Fixes Switch to upstream vLLM #22

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[coolkp]

/assign conliu

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