SLA and SageSLA (SLA based on SageAttention) Code Update

[jt-zhang]

1. We’ve just updated the Triton implementation of SLA. Training is now more stable, faster, and typically achieves better training results.

2. We’ve released the code for SageSLA, a very fast SLA (Sparse-Linear Attention) forward pass based on SageAttention. It uses some code from SpargeAttn. Please refer to the SageSLA/ directory for how to use SageSLA.

Feel free to try it out!