create contextmanager and refactor docgeneratorTemplateType

src/Bundle/ChillDocGeneratorBundle/Context/ContextManager.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Chill\DocGeneratorBundle\Context;
+
+class ContextManager
+{
+    private iterable $contexts;
+
+    /**
+     * @param iterable $contexts
+     */
+    public function __construct(iterable $contexts)
+    {
+        $this->contexts = $contexts;
+    }
+
+    public function getContext(): array
+    {
+        return iterator_to_array($this->contexts);
+    }
+}