AsyncDiff

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Breaking Changes:

• Manual init of distributed environment
• Requires an additional pipeline_type argument (to set pipe_id)
• Changed time_shift argument from boolean to integer

Other Changes:

• Allow stride > 2
• Support FLUX.1
• Support Z-Image
• Add cached_step argument (e.g. 4 cached_step = skips every 4th step by reusing cached result)