Implementation of Self Attention Guidance in webui

https://arxiv.org/abs/2210.00939

Demos:

For SDXL model, adjust Blur Sigma around 0.34 to prevent blurry image
Bilinear interpolation: Attention mask is interpolated using bilinear method, resulting sharper image
Attention target: Choose the block Attention mask would apply to, dynamic means depending on noise sigma value
Base resolution: Change attention mask resolution