Implementing Stable Diffusion Infinity style outpainting into automatic1111

[AndrosNY]

First of all I would like to thank you for the AMAZING repo you have created and are constantly evolving. I just got into outpainting with the new 1.5 outpainting model which is amazing compared to the old one and wonder if it would be possible to add an outpainting tab next to the inpainting in the style of Stable Diffusion Infinity to make the workflow even more convenient without having to close this repo and open the SD Infinity to start outpainting. Once again, thank you so much for your work so far.

[Ehplodor]

Please look into #3318