Adds Rector PHP for automated refactoring

Introduces Rector to the project for automated code refactoring and upgrades.

Includes initial configuration to target the `src` and `tests` directories, and sets up a basic ruleset from `assoconnect/php-quality-config`.

Author: jwaguet

composer.json

@@ -27,6 +27,7 @@
 		"symfony/filesystem": "^6.0"
     },
     "require-dev": {
-		"symfony/test-pack": "^1.0"
+		"symfony/test-pack": "^1.0",
+		"rector/rector": "^2.2"
 	}
 }

composer.lock

@@ -0,0 +1,19 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\Config\RectorConfig;
+
+return RectorConfig::configure()
+    ->withPaths([
+        __DIR__ . '/src',
+        __DIR__ . '/tests',
+    ])
+    // uncomment to reach your current PHP version
+    // ->withPhpSets()
+    ->withTypeCoverageLevel(0)
+    ->withDeadCodeLevel(0)
+    ->withCodeQualityLevel(0)
+    ->withSets([
+        __DIR__ . '/vendor/assoconnect/php-quality-config/src/Rector/rules.php',
+    ]);