add fp8 gemm path choice for rocm_aiter_gemm_w8a8_blockscale #659
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rocm_aiter_gemm_w8a8_blockscale supports multiple dispatch methods. An env flag VLLM_USE_AITER_TRITON_GEMM is added to control whether to use Triton GEMM or CK GEMM for this kernel.
Default (VLLM_USE_AITER_TRITON_GEMM=false): use CK GEMM path with wfp8afp8.
Enabled (VLLM_USE_AITER_TRITON_GEMM=true or 1): use triton wfp8afp8 gemm.
perf and acc comparison:
