Support FlashAttention4

**Is your feature request related to a problem? Please describe:**
A clear and concise description of what the problem is.

**Describe the solution you would like:**
A clear and concise description of what you want to happen.

**Describe the alternatives you have considered:**
A clear and concise description of any alternative solutions or features you have considered.

**Additional Context:**
Add any other context about the feature request here.