feat: Report histogram metrics to Triton metrics server#56

yinggeh merged 6 commits intoyinggeh-DLIS-7061-add-vllm-metricstriton-inference-server/vllm_backend:yinggeh-DLIS-7061-add-vllm-metricsfrom

yinggeh-DLIS-7113-support-histogram-metric-typetriton-inference-server/vllm_backend:yinggeh-DLIS-7113-support-histogram-metric-typeCopy head branch name to clipboard