Deduplicate ipex initialization code

[akx]

This PR moves the repeated IPEX/XPU initialization code to a single place in library/ipex_interop.py.

cc @Disty0

[Disty0]

1. Don't change the init name to init_ipex and don't cahange the return values.
   I use my IPEX library with multiple projects. Unless you want to change them in every single project i use this library on, don't change them.

2. I am not sure if ipex will work with importing it in a submodule instead of the main file.
   This needs testing when i get back to home.

3. My purpose with using try / expect in the main file is that anything can happen in ipex libs (including straight up deleting it) and non ipex users will still be fine.
   This change makes it that if there is an issue with the ipex libs, entire script will error out.

[akx]

Thanks for the comments!

Don't change the init name to init_ipex and don't cahange the return values. I use my IPEX library with multiple projects. Unless you want to change them in every single project i use this library on, don't change them.

Fair, I can change those back – you could consider packaging your library as an actual Python package, though. If you need a hand with that, please let me know.

I am not sure if ipex will work with importing it in a submodule instead of the main file.

It shouldn't have any technical difference. All this PR does is move the same code into a function and call it.

This change makes it that if there is an issue with the ipex libs, entire script will error out.

I don't think so. The exact same exception handling is in the new initialization function, although in a slightly different form. Anyway, I'll change this a little more to avoid touching library/ipex at all :)

[Disty0]

Other than the logging i mentioned, this pr is good to merge.

[kohya-ss]

Thank you for this PR and reviewing!