🔧 chore(utils.py): add support for handle_keys in build_input_keys_response function

The build_input_keys_response function now includes support for handle_keys in the response. This allows the function to populate the handle_keys field in the response with the values from the artifacts dictionary, if available.

src/backend/langflow/api/utils.py

@@ -30,6 +30,7 @@ def build_input_keys_response(langchain_object, artifacts):
     input_keys_response = {
         "input_keys": {key: "" for key in langchain_object.input_keys},
         "memory_keys": [],
+        "handle_keys": artifacts.get("handle_keys", []),
     }
 
     # Set the input keys values from artifacts