taking Price Impact into account for partial trade size

[rouzwelt]

Motivation

Caution

Do NOT merge before #430

This PR enables accounting for sushi's swap Price Impact for finding the partial trade size.

Solution

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• made this PR as small as possible
• unit-tested any new functionality
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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch 2026-02-12-price-impact

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