[None][feat] Nano-v3 stack PRs v2

[Wanli-Jiang]

Stacked PRs:

• [#9102][feat] AutoDeploy: Support fp8 kv cache #9107
• [None][feat] AutoDeploy: Perf improvement for small batch size #9163
• Added nano_v3_bench.yaml

CMD to launch trtllm-serve for bench:

trtllm-serve <ckpt_folder_path> \
--host 0.0.0.0 \
--port 8000 \
--backend _autodeploy \
--trust_remote_code \
--extra_llm_api_options examples/auto_deploy/nano_v3_bench.yaml