feat: Pi-Flow (low step adapters) for FLUX-dev #697
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Workflow. Requires 'Pi-Flow Sampler' and 'Model Sampling Pi Flow' nodes from ComfyUI Pi-Flow repository (https://github.com/Lakonik/ComfyUI-piFlow/tree/main). 
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Pizzawookiee
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Motivation
Implement Pi-Flow into Nunchaku SVDQuant FLUX Dev. Intended for use for 'Pi-Flow Sampler' and 'Model Pi-Flow Sampling' nodes from ComfyUI Pi-Flow repository (https://github.com/Lakonik/ComfyUI-piFlow/tree/main).
Pi-Flow allows 4-step and 8-step adapters to FLUX Dev.
Modifications
Adds a new node 'NunchakuFLUXPiFlowDiTLoader'. Requires an adapter file from Pi-Flow's huggingface repo (https://huggingface.co/Lakonik/pi-FLUX.1/tree/main), either gmmflux_k8_piid_4step or gmmflux_k8_piid_8step. Place adapter file in LoRA folder.
Notes: