Adds Rector for automated code refactoring (#36)

Introduces Rector to automate code improvements and standardization.

This includes adding the rector/rector dependency and configuring Rector with predefined rulesets and paths for source and test files.

Author: jwaguet

composer.json

@@ -22,7 +22,8 @@
         }
     },
     "require-dev": {
-        "assoconnect/php-quality-config": "^1.12"
+        "assoconnect/php-quality-config": "^1.12",
+        "rector/rector": "^1.2"
     },
     "require": {
         "php": "^8.2",

rector.php

@@ -0,0 +1,17 @@
+<?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)
+    ->withSets([
+        __DIR__ . '/vendor/assoconnect/php-quality-config/src/Rector/rules.php',
+    ]);