common-canvas stable-diffusion sdxl commercial CommonCanvas StabilityAI mosaicML multimodalart Wauplin lhoestq text-to-image en dataset:common-canvas/commoncatalog-cc-by-sa dataset:common-canvas/commoncatalog-cc-by dataset:flickr100m dataset:pag arxiv:2310.16825 license:cc-by-sa-4.0 region:us