Accurate sizes: Reorganize file structure by feature

[joemcgill]

Summary

This reorganizes the file structure of the Enhanced Responsive Images plugin (i.e. auto-sizes) to separate the functionality for the original auto-sizes implementation from the functionality for the improved sizes calculation being worked on in #1511. This reorganization is meant to make it easier follow where code relevant to each feature exists and to ensure they stay as separate functionality within the plugin.

Relevant technical choices

All function definitions have been moved into one of two files in the /includes/ directory:

• /includes/auto-sizes.php: Functions related to auto-sizes
• /includes/improve-calculate-sizes: Function related to improving the default wp_calculate_image_sizes algorithm
• Renames tests/test-improve-sizes to tests/test-improve-calculate-sizes for consistency with the related functions file and renames the related test class accordingly
• All add_filter() hooks remain in hooks.php
• The default plugin action for rendering the generator tag remains in hooks.php

[github-actions]

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Co-authored-by: joemcgill <[email protected]>
Co-authored-by: felixarntz <[email protected]>
Co-authored-by: mukeshpanchal27 <[email protected]>

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