Support fp8 dynamic quantization for fmha #3206
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Proposed changes
Implement dynamic quant for fmha to replace elder static quant.
Now, user need to pass descale of qkv for dynamic quant
Checklist
./bin/tile_example_fmha_fwd -warmup=0 -repeat=1 -init=3 -b=1 -s=128 -h=1 -d=128 -prec=fp8bf16 -qscale=1