feat: add pab and fastercache

[nifleisch]

Description

This PR adds the PAB and FasterCache algorithms from diffusers (https://huggingface.co/docs/diffusers/main/api/cache).

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

I manually tested both caching mechanisms across all supported Diffusers pipelines, visually inspected the resulting images, videos, and measured the speed improvements (the relative speedups match this benchmark). For FLUX, I evaluated every supported combination of algorithms. I also implemented tests for each algorithm and their combinations.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Additional Notes

I attempted to enable compilation for these caching mechanisms but encountered errors. The core issue is that they introduce conditional logic into the attention layer, which prevents successful compilation.