add form to doc generation and custom form to admin template configuration

src/Bundle/ChillDocGeneratorBundle/Context/ContextManager.php

@@ -40,6 +40,17 @@ class ContextManager
         throw new ContextNotFoundException($docGeneratorTemplate->getContext());
     }
 
+    public function getContextByKey(string $searchedKey): DocGeneratorContextInterface
+    {
+        foreach ($this->contexts as $key => $context) {
+            if ($searchedKey === $key) {
+                return $context;
+            }
+        }
+
+        throw new ContextNotFoundException($searchedKey);
+    }
+
     public function getContexts(): array
     {
         return iterator_to_array($this->contexts);