Fp8 block scale quantization for fmha fwd (#3330)

* add block scale parameters to kernel

* add block scale to kernel

* add smoke test

* format

* Revert "format"

This reverts commit 356c3c9706.

* only format my code

* format py

* fix auto not allowd in function prototype

* change instance tttt to ttff

* fix structured binding issue

* change s_acc elementwise op

* async pipeline add block scale

* add quantation P using shift exp2

* precompute (m - shift) once per row

* change blk scale seqstrt ptr name

* fix some name

* fix for  deduction guide

* fix some comments

* add P scale to qr_ksvs_pipeline

* add comment to idx_identity

* change the method of calculating descale block index

* unify naming style: use block_scale_ as name prefix

* unify naming style

* update the CHANGELOG.md

* Add FP8 block scale quantization support for FMHA forward kernel

---------

Co-authored-by: Illia Silin <98187287+illsilin@users.noreply.github.com>
Co-authored-by: Po Yen Chen <PoYen.Chen@amd.com>

[ROCm/composable_kernel commit: dd0b4294af]

include/ck_tile/core/numeric/math.hpp

@@ -37,6 +37,13 @@ struct scales
         return lhs_ * rhs;
     }
 
+    template <typename OtherScale>
+    CK_TILE_HOST_DEVICE constexpr auto operator*(OtherScale other) const
+    {
+        auto new_scale = lhs_ * other;
+        return scales<std::decay_t<decltype(new_scale)>>(new_scale);
+    }
+
     private:
     Scale lhs_;
 };