feat: use phpstan extension installer

[ictbeheer]

This pull request updates the project's static analysis tooling by adding the phpstan/extension-installer package and making related configuration changes. The main goal is to simplify and automate the registration of PHPStan extensions.

Dependency and configuration updates:

• Added phpstan/extension-installer to the require-dev section in composer.json to automatically register PHPStan extensions.
• Updated the allow-plugins section in composer.json to permit phpstan/extension-installer to run as a Composer plugin.

PHPStan configuration simplification:

• Removed manual includes for the Larastan and WordPress PHPStan extensions from phpstan.neon.dist, as these are now handled automatically by the extension installer.

[github-actions]

Composer package changes

Dev Packages	Operation	Base	Target	Link	License
phpstan/extension-installer	New	-	1.4.3	Compare	MIT

[github-actions]

Coverage report for commit: dbc1cfe
File: coverage.xml

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Summary - Lines: 100.00% | Methods: 100.00%

Files	Lines	Methods	Branches
src/Console
ExampleCommand.php	100.00%	100.00%	100.00%
src
Example.php	100.00%	100.00%	100.00%
SkeletonPackageServiceProvider.php	100.00%	100.00%	100.00%

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[Copilot]

Pull request overview

This PR updates the project’s PHPStan setup to rely on phpstan/extension-installer rather than manually including individual PHPStan extension NEON files.

Changes:

• Removed manual includes entries from phpstan.neon.dist.
• Added phpstan/extension-installer to require-dev and allowed it under Composer allow-plugins.
• Updated composer.lock to include the new plugin and reflect updated lock metadata.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
phpstan.neon.dist	Removes explicit Larastan/WordPress extension includes in favor of extension installer-based discovery.
composer.json	Allows the Composer plugin and adds phpstan/extension-installer as a dev dependency.
composer.lock	Locks the new plugin and updates lock metadata/platform overrides accordingly.

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[Copilot]

With the explicit Larastan and WordPress extension includes removed, PHPStan will no longer load those extensions unless the extension-installer generated config is included. Add an includes section that points to the extension-installer config (typically the file it generates under vendor/phpstan/extension-installer/) so phpstan-extension packages are still registered.