refactor(php-cs-fixer): Move rules to external config file

php-cs-fixer-config

@@ -0,0 +1,24 @@
+#!/usr/bin/php
+<?php
+
+error_reporting(E_ALL);
+
+$finder = \PhpCsFixer\Finder::create();
+
+$config = new \PhpCsFixer\Config();
+$config->setRules([
+    '@PSR12' => true,
+    'ordered_imports' => ['sort_algorithm' => 'alpha'],
+    'concat_space' => ['spacing' => 'one'],
+    'whitespace_after_comma_in_array' => true,
+    'align_multiline_comment' => true,
+    'no_unused_imports' => true,
+    'phpdoc_align' => true,
+    'phpdoc_indent' => true,
+    // 'psr_autoloading' => true,
+    'no_useless_return' => true,
+    'return_assignment' => true,
+    'trailing_comma_in_multiline' => true,
+])->setRiskyAllowed(true);
+
+return $config->setFinder($finder);