[feat] Support NVFP4 KV Cache

[Tom-Zheng]

[feat] Support NVFP4 KV Cache

Description

Supports NVFP4 KV Cache.

Test Coverage

accuracy/test_llm_api_pytorch.py::TestLlama3_1_8BInstruct::test_fp8[kv_cache_dtype=nvfp4-attn_backend=TRTLLM-torch_compile=False]
accuracy/test_llm_api_pytorch.py::TestLlama3_1_8BInstruct::test_fp8[kv_cache_dtype=nvfp4-attn_backend=TRTLLM-torch_compile=True]

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[Tom-Zheng]

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[nvzhihanj]

@Tom-Zheng is it possible to get a rebase of this MR on the top of main? MLPerf team and Shengliang would like to test this MR and see if we can get passing accuracy with nvfp4. It could potentially benefit 405B on GB200/300 in disagg case.
cc: @kaiyux as well.

[Tom-Zheng]

@Tom-Zheng is it possible to get a rebase of this MR on the top of main? MLPerf team and Shengliang would like to test this MR and see if we can get passing accuracy with nvfp4. It could potentially benefit 405B on GB200/300 in disagg case. cc: @kaiyux as well.

Sure, working on it.

[Tom-Zheng]

Rebased PR: #6244