feat: add performance sdxl lightning #2415
Merged
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closes #2382, links to discussion #2318 & #2416
Based on https://huggingface.co/ByteDance/SDXL-Lightning/blob/main/sdxl_lightning_4step_lora.safetensors
Also read https://www.felixsanz.dev/articles/sdxl-lightning-quick-look-and-comparison#checkpoint-comparison (#2318 (comment) @felixsanz).
Disables negative prompt for even faster generation with cfg = 1, even though it's capable of handling negative prompts with cfg > 1.