Feature request: Tiled Image support

I'm interested in creating tiled images.

https://github.com/invoke-ai/InvokeAI/pull/339 seems to implement it in InvokeAI. [TomMoore515/material_stable_diffusion](https://github.com/replicate/cog-stable-diffusion/compare/main...TomMoore515:material_stable_diffusion:main) seems to implement it in SD. It's available in *a bunch* of places, including A1111 and a bunch of HF spaces. According @TomMoore515's modifications, it seems impossibly easy.