GQA Memory Efficient Kernel (#17920)
Implement Cutlass Memory Efficient Attention Kernel into Group Query
Attention Operator.
### Motivation and Context
Before this change, Group Query Attention Operator was supported only by
Flash-Attention. While this is the most efficient kernel for the
operation, it only supports sm >= 80. Cutlass Memory Efficient Attention
Kernel supports sm >= 53, allowing us to support a broader range of GPU
hardware.
