stable-diffusion.cpp as backend

[razvanab]

Is your feature request related to a problem? Please describe.
Installing yet another Python environment for SD beside the one I have already.

Describe the solution you'd like
Using stable-diffusion.cpp as backend for generation.

Describe alternatives you've considered
Installing yet another Python environment for SD beside the one I have already....

Additional context
stable-diffusion.cpp github repo:
https://github.com/leejet/stable-diffusion.cpp