[feat] Allow overriding cli args with yaml file in trtllm-serve

[pcastonguay]

Description

Prior to this PR, calling:

trtllm-serve serve TinyLlama/TinyLlama-1.1B-Chat-v1.0 --extra_llm_api_options llm_api_config.yaml

with llm_api_config.yaml with:

tensor_parallel_size: 1

would give an error:

TypeError: tensorrt_llm.commands.serve.get_llm_args() got multiple values for keyword argument 'tensor_parallel_size'

because tp_size is also a cli argument. After this PR, this will now be supported.

Test Coverage

Added a unit test that was failing prior to this MR, but now passes.

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[pcastonguay]

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[tensorrt-cicd]

PR_Github #4599 [ run ] triggered by Bot

[tensorrt-cicd]

PR_Github #4599 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #3313 completed with status: 'SUCCESS'