chore(API-1925): Add rector dev dependency

Author: LevFlavien

Makefile

@@ -37,3 +37,7 @@ cs: ## Run code style check
 .PHONY: fix-cs
 fix-cs: ## Fix PHP code style
 	$(DOCKER_RUN) bin/php-cs-fixer fix --config=.php_cs.php
+
+.PHONY: rector
+rector: ## Run rector
+	$(DOCKER_RUN) bin/rector

composer.json

@@ -37,7 +37,8 @@
     "symfony/yaml": "^4.2",
     "donatj/mock-webserver": "^2.0",
     "http-interop/http-factory-guzzle": "^1.0",
-    "php-http/guzzle6-adapter": "^2.0"
+    "php-http/guzzle6-adapter": "^2.0",
+    "rector/rector": "^0.14.6"
   },
   "config": {
     "bin-dir": "bin",

composer.lock

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+use Rector\CodeQuality\Rector\Class_\InlineConstructorDefaultToPropertyRector;
+use Rector\Config\RectorConfig;
+use Rector\Php73\Rector\FuncCall\JsonThrowOnErrorRector;
+use Rector\Set\ValueObject\LevelSetList;
+use Rector\Set\ValueObject\SetList;
+
+return static function (RectorConfig $rectorConfig): void {
+    $rectorConfig->paths([
+        __DIR__ . '/src',
+        __DIR__ . '/tests',
+        __DIR__ . '/spec'
+    ]);
+
+    $rectorConfig->skip([
+        JsonThrowOnErrorRector::class
+    ]);
+
+    $rectorConfig->rule(InlineConstructorDefaultToPropertyRector::class);
+
+    $rectorConfig->sets([
+        SetList::CODE_QUALITY,
+        LevelSetList::UP_TO_PHP_80
+    ]);
+};