Add reload_on_trigger_change

### Description Using the quickstart setup, for plugin changes there exists `reload_on_plugin_change = True` which when True causes the workers to restart on a change to the code in plugins. For triggers there is no similar option and workers are not automatically restarted on a change to triggers in plugins. ### Use case/motivation Add equivalent functionality for triggers to that which exists for plugins, where related workers are restarted so that trigger changes are picked up. ### Related issues _No response_ ### Are you willing to submit a PR? - [ ] Yes I am willing to submit a PR! ### Code of Conduct - [X] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)