Add Composer autoloading functions and PHPStan for testing

vendor/nikic/php-parser/lib/PhpParser/Node/Stmt/TraitUseAdaptation.php

@@ -0,0 +1,13 @@
+<?php declare(strict_types=1);
+
+namespace PhpParser\Node\Stmt;
+
+use PhpParser\Node;
+
+abstract class TraitUseAdaptation extends Node\Stmt
+{
+    /** @var Node\Name|null Trait name */
+    public $trait;
+    /** @var Node\Identifier Method name */
+    public $method;
+}