Support KeyValue Type for Ruby PHP and Python

Summary: Add support of type KeyValue to Ruby, PHP, and Python.

Reviewed By: mengxuanzhangz

Differential Revision: D53016094

fbshipit-source-id: 50409b3f7f5f8df38853e266edf46e781c269a47

facebook_business/adobjects/leadgenform.py

@@ -276,7 +276,7 @@ def create_test_lead(self, fields=None, params=None, batch=None, success=None, f
         'questions': 'list<LeadGenQuestion>',
         'status': 'string',
         'thank_you_page': 'LeadGenThankYouPage',
-        'tracking_parameters': 'list<map<string, string>>',
+        'tracking_parameters': 'list<KeyValue>',
     }
     @classmethod
     def _get_field_enum_info(cls):