Changes to food scaling function

[jucordero]

Description

This pull requests partially addresses #93 by extending the functionality of balanced_scaling.

To-do list

• Add a threshold value or cap scaling to implement the food_waste functionality
• Allow scaling based on converted values of the input food balance sheet array
• Allow multiple items lists and item/item group dependent scaling
• Automatically create non-existing padding items

Checklist

• Follow the Contributor Guidelines
• Write unit tests
• Write documentation strings

[Copilot]

Pull request overview

This PR extends balanced_scaling to support (a) keeping totals constant with optional “padding” items and (b) scaling based on pre-converted quantities via a conversion_arr. It also introduces a new pipeline-compatible helper (scale_above_threshold) intended to support “food_waste”-style threshold scaling.

Changes:

• Add conversion_arr support to balanced_scaling (convert → scale → convert back).
• Add padding_items / non-finite handling to balanced_scaling constant-balancing logic.
• Add scale_above_threshold pipeline node and expand tests for a no-Year case.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 10 comments.

File	Description
agrifoodpy/food/model.py	Extends balanced_scaling (conversion + constant balancing changes) and adds new scale_above_threshold pipeline node.
agrifoodpy/food/tests/test_model.py	Adds a balanced_scaling test case for datasets without a Year dimension and adjusts expected outputs.

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