Update overall setup of the module

[remyperona]

This PR modernizes the module setup by updating PHP and WordPress version requirements, reorganizing the project structure, and improving code quality tooling. The changes prepare the library for modern PHP development standards.

Key changes:

• Bumps minimum PHP version from 7.0 to 7.4 and WordPress from 5.3 to 6.6
• Reorganizes source code into inc/ directory with updated autoloading
• Modernizes test infrastructure with proper PHPUnit configuration and test case naming conventions
• Updates development dependencies and CI workflows

[Copilot]

Pull request overview

This PR modernizes the module setup by updating PHP and WordPress version requirements, reorganizing the project structure, and improving code quality tooling. The changes prepare the library for modern PHP development standards.

Key changes:

• Bumps minimum PHP version from 7.0 to 7.4 and WordPress from 5.3 to 6.6
• Reorganizes source code into inc/ directory with updated autoloading
• Modernizes test infrastructure with proper PHPUnit configuration and test case naming conventions
• Updates development dependencies and CI workflows

Reviewed changes

Copilot reviewed 44 out of 57 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
phpstan.neon.dist	Increased PHPStan level to 5, updated paths to scan inc/ and Tests/, added WordPress stub files
phpcs.xml.dist	Updated scan paths to inc/ and Tests/, removed several rule exclusions, updated PHP/WP version requirements
composer.json	Updated PHP requirement to 7.4+, modernized dev dependencies, restructured autoloading to use inc/ directory
inc/*.php	Renamed parameter $default to $default_value for clarity, added void return types, fixed spacing
Tests/Unit/*.php	Added strict types, renamed test classes to PascalCase convention, added PHPDoc type hints, removed extra blank lines
Tests/Integration/*.php	Added strict types, renamed test classes to PascalCase convention, added PHPDoc type hints, fixed method names
Tests/Fixtures/*.php	Aligned array formatting for consistency
.github/workflows/*.yml	Replaced legacy workflow files with modern reusable workflows for PHPUnit, PHPStan, and PHPCS

Comments suppressed due to low confidence (2)

Tests/Integration/SiteOptions/DeleteTest.php:19

• Corrected spelling of 'testShoulDeleteOption' to 'testShouldDeleteOption'.
  inc/OptionArray.php:1
• [nitpick] The spacing in the PHPDoc is inconsistent. Line 60 has two spaces between @param mixed and $value, while line 61 has only one space between @param mixed and $default_value. These should be consistently aligned.

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