feat: Add support for Triton request cancellation

[achartier]

PR title

feat: Add support for Triton request cancellation

Description

Handle request cancellation in Triton torch backend:

• Add handling for stop signal
• Add cancellation thread checking for cancellation status every ms

Add llmapi_client script to test the feature

Extend existing test to check cancellation works

Test Coverage

test_llmapi_backend

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[achartier]

/bot run --stage-list "A30-Triton-Post-Merge-1, A30-Triton-Post-Merge-2, B200_PCIe-Triton-Post-Merge-1, A100X-Triton-Post-Merge-1, A100X-Triton-Post-Merge-2"

[tensorrt-cicd]

PR_Github #11593 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #11593 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #8587 (Partly Tested) completed with status: 'SUCCESS'

[achartier]

/bot run --stage-list "A30-Triton-Post-Merge-1, A30-Triton-Post-Merge-2, B200_PCIe-Triton-Post-Merge-1, A100X-Triton-Post-Merge-1, A100X-Triton-Post-Merge-2"

[tensorrt-cicd]

PR_Github #11667 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #11667 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #8639 (Partly Tested) completed with status: 'SUCCESS'

[achartier]

/bot run

[tensorrt-cicd]

PR_Github #11695 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #11695 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #8657 completed with status: 'SUCCESS'

[pcastonguay]

@SimengLiu-nv could you also have a look please? Thanks.

[SimengLiu-nv]

The implementation looks good to me.
I hope more testing can be added, for example: Send stop to a request id that doesn't exist. Or already completed.