Log modules at startup (#11813)

Author: babolivier

changelog.d/11813.misc

@@ -0,0 +1 @@
+Log module names at startup.

synapse/app/_base.py

@@ -435,7 +435,8 @@ def run_sighup(*args: Any, **kwargs: Any) -> None:
     # before we start the listeners.
     module_api = hs.get_module_api()
     for module, config in hs.config.modules.loaded_modules:
-        module(config=config, api=module_api)
+        m = module(config=config, api=module_api)
+        logger.info("Loaded module %s", m)
 
     load_legacy_spam_checkers(hs)
     load_legacy_third_party_event_rules(hs)