issue callbacks per item and retry fails

- now workers passes queue to task_executor so it can send back events per item and on retry attempt
- updated result class to pass along events to strategy
- base strategy updated to forward new events to callback
- callbacks now remove 'items' on final result but process them directly when invoked per item
- new callback method to deal with retry attempt messages (also now obeys nolog)
- updated tests to match new signature of task_executor

fixes #14558
fixes #14072

lib/ansible/plugins/strategy/__init__.py

@@ -329,7 +329,8 @@ class StrategyBase:
                                 self._variable_manager.set_nonpersistent_facts(target_host, facts)
                             else:
                                 self._variable_manager.set_host_facts(target_host, facts)
-
+                elif result[0].startswith('v2_playbook_item') or result[0] == 'v2_playbook_retry':
+                    self._tqm.send_callback(result[0], result[1])
                 else:
                     raise AnsibleError("unknown result message received: %s" % result[0])