diffusers safetensors stable-diffusion stable-diffusion-diffusers text-to-image merge en arxiv:2403.13257 arxiv:2403.19522 arxiv:2311.03099 arxiv:2306.01708 arxiv:2203.05482 license:creativeml-openrail-m autotrain_compatible endpoints_compatible diffusers:StableDiffusionXLPipeline region:us