digits display option doesn't get passed to AIC/BIC

[strengejacke]

Fixes #861

[gemini-code-assist]

Summary of Changes

Hello @strengejacke, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This PR addresses a bug where the digits option didn't affect AIC/BIC display. It refactors the print.performance_model method to R/print-methods.R and updates documentation for display() to introduce an ic_digits argument, allowing explicit control over AIC/BIC decimal places. An example demonstrating its usage is also added.

Highlights

• Intent: This pull request aims to fix an issue where the digits display option was not correctly applied to Information Criteria (AIC/BIC) values when using the display() function. The fix introduces a dedicated ic_digits argument to control the precision of these values.
• Changes: The primary change involves refactoring the print.performance_model S3 method by moving its definition from R/model_performance.R to R/print-methods.R. This change centralizes print-related methods. Additionally, the documentation for display.performance_model and print.performance_model (now linked via @rdname) has been updated to clarify that the ... argument can accept ic_digits to specify the number of decimal places for AIC/BIC. A new example display(mp, digits = 3, ic_digits = 4) has been added to demonstrate this functionality.
• Reviewer Activity: No specific reviewer activity has been recorded for this pull request yet.

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[gemini-code-assist]

Code Review

Overall, this pull request effectively addresses the issue of controlling the number of digits for AIC/BIC values by improving the documentation and providing a clear example. The refactoring of print.performance_model into its own R/print-methods.R file is a good move for better code organization and maintainability. I have one suggestion to improve the clarity of the newly moved function.