[TRTLLM-5050][feat] Enable per-request stats with PyT backend

[pcastonguay]

Description

Adds support for per-request stats via 'metrics' endpoint. Per-request stats can be obtained with the bollowing pytorch_backend_config parameters:

   enable_iter_perf_stats
   enable_iter_req_stats

Test Coverage

test_llm.py

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run [--disable-fail-fast --skip-test --stage-list "A10-1, xxx" --gpu-type "A30, H100_PCIe" --add-multi-gpu-test --only-multi-gpu-test --disable-multi-gpu-test --post-merge --extra-stage "H100_PCIe-[Post-Merge]-1, xxx"]

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[pcastonguay]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #4593 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #4593 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #3307 completed with status: 'FAILURE'

[pcastonguay]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #4631 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #4631 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #3340 completed with status: 'FAILURE'

[pcastonguay]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #4721 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #4721 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #3406 completed with status: 'FAILURE'

[pcastonguay]

/bot run --disable-fail-fast

[tensorrt-cicd]

PR_Github #4874 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #4874 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #3532 completed with status: 'SUCCESS'

[SimengLiu-nv]

@pcastonguay I got bug with function. The input of get_queued_req_stats is a tuple, not LlmRequest. self.request_queue.put((self.next_req_id, request))