Support XYZ scripts / split hires path from unet

[aria1th]

Description

Supports XYZ options for Hypertile setups
Extends swap size option
Separates HR pass option from Unet option, so that hypertile can only work for hr pass

Hypertile has Swap size problem (as far as I know)

And as conclusion - I'd just let swap size to biggest one that we can use.

All images were generated with Blessed2 VAE, CuteYukiMix, with prompt 1girl, easynegative, nsfw

Here is example with 512x768 without any hr-pass.

With 1024x1536, of course it won't work without hr pass, so maybe with kohya's hires fix:

Or default

With swap size 1, we can observe significant artifacts which caused by 'unknown nearby pixels', splitted by hypertile.

By allowing bigger swap sizes, we can usually avoid the artifacts with minimal performance degradation.

(There will be additional patch to pre-calculate list of divisors and cache it too)

Also, I observed that LCM scheduler + LCM Lora will improve performance and reduce artifact in some aspect too.
(1024x1024 with kohya's hires fix, 10 step test)

Screenshots/videos:

1024x1408 with kohya hires fix

512x704, 2x hires fix with Anime6B (denoise 0.5):

Some close-up, almost no artifact for 512x704 + 2x hires fix

TODO : fix some code snippets, cache divisors

Checklist:

• I have read contributing wiki page
• I have performed a self-review of my own code
• My code follows the style guidelines
• My code passes tests