[TRTLLM-5921][feat] Prevent serialization of entire LoRA adapters in each request

[amitz-nv]

Description

Make LoRA pytorch to broadcast weights & config tensors only on new LoRA adapter, so when the adapter is already loaded on rank 0 (and thus, should be loaded on other ranks as well), only the adapter ID is sent in the request.

NOTE: The changes in this PR cause requests with a LoRA adapter that were previously unloaded from LoRA CPU cache not to work, as they remain in _cpp_lora_weights in LoraManager python class. It was decided that for now this flow is not supported, in favor of its significant performance boost.

Test Coverage

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[amitz-nv]

/bot run --stage-list "DGX_H100-4_GPUs-PyTorch-Others-1"

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PR_Github #8251 [ run ] triggered by Bot

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PR_Github #8251 [ run ] completed with state SUCCESS
/LLM/main/L0_MergeRequest_PR pipeline #5977 (Partly Tested) completed with status: 'FAILURE'

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[shaharmor98]

One small last comment.
LGTM

[shaharmor98]

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PR_Github #9874 [ run ] completed with state SUCCESS
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