[PRX pipeline]: add 1024 resolution ratio bins

[DavidBert]

What does this PR do?

Add 1024 resolution aspect ratio bins to PRX pipeline

This PR adds support for 1024 resolution aspect ratio binning in the PRX pipeline.

Changes

• Added ASPECT_RATIO_1024_BIN with 24 aspect ratios ranging from 0.49 (704x1440) to 2.05 (1440x704)
• Created ASPECT_RATIO_BINS dictionary mapping resolutions (256, 512, 1024) to their respective aspect ratio bins
• Simplified resolution binning logic to use dictionary lookup instead of comparisons
• Added validation at generation time to provide clear error message when using unsupported resolutions with use_resolution_binning=True

This enables the pipeline to properly handle 1024 resolution models while maintaining backward compatibility with 256 and 512 resolution models.

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• Did you write any new necessary tests?

Who can review?

@yiyixuxu, @asomoza and @sayakpaul

[sayakpaul]

Sweet! Thank you.

[HuggingFaceDocBuilderDev]

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