Extract rendering of a single block to extra class

[MAILPOET-2665]

lib/Form/BlocksRenderer.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace MailPoet\Form;
+
+class BlocksRenderer {
+  public function renderBlock(array $block = []): string {
+    $html = '';
+    switch ($block['type']) {
+      case 'html':
+        $html .= Block\Html::render($block);
+        break;
+
+      case 'divider':
+        $html .= Block\Divider::render();
+        break;
+
+      case 'checkbox':
+        $html .= Block\Checkbox::render($block);
+        break;
+
+      case 'radio':
+        $html .= Block\Radio::render($block);
+        break;
+
+      case 'segment':
+        $html .= Block\Segment::render($block);
+        break;
+
+      case 'date':
+        $html .= Block\Date::render($block);
+        break;
+
+      case 'select':
+        $html .= Block\Select::render($block);
+        break;
+
+      case 'text':
+        $html .= Block\Text::render($block);
+        break;
+
+      case 'textarea':
+        $html .= Block\Textarea::render($block);
+        break;
+
+      case 'submit':
+        $html .= Block\Submit::render($block);
+        break;
+    }
+    return $html;
+  }
+}