[V1] feat: support fp8 kv on ampere through flashinfer#1440
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Works with prefix caching and chunked prefill. Tested on A100:
Need flashinfer first:
FI uses JIT compilation for its CUDA kernels, so the first request will take a few minutes to complete.
APHRODITE_ATTENTION_BACKEND="FLASHINFER" aphrodite run Qwen/Qwen3-0.6B \ --kv-cache-dtype fp8