Add type annotations

Signed-off-by: mulhern <amulhern@redhat.com>

Author: mulkieran

scripts/monitor_dbus_signals.py

@@ -21,6 +21,7 @@
 # isort: STDLIB
 import os
 import xml.etree.ElementTree as ET
+from typing import List
 
 # isort: THIRDPARTY
 import dbus
@@ -499,7 +500,12 @@ def _properties_changed(*props_changed, object_path=None):
         except Exception as exc:  # pylint: disable=broad-except
             _CALLBACK_ERRORS.append(exc)
 
-    def _monitor(service, manager, manager_interfaces, interface_re):
+    def _monitor(
+        service: str,
+        manager: str,
+        manager_interfaces: List[str],
+        interface_re: re.Pattern,
+    ):
         """
         Monitor the signals and properties of the manager object.