Speed limit controller

Added toggle to control the cruise set speed according to speed limit supplied by OSM, NOO, or the vehicle itself.

Co-Authored-By: Jacob Pfeifer <jacob@pfeifer.dev>
Co-Authored-By: Efini <19368997+efini@users.noreply.github.com>
Co-Authored-By: Kumar <36933347+rav4kumar@users.noreply.github.com>
Co-Authored-By: Jason Wen <haibin.wen3@gmail.com>

selfdrive/controls/lib/events.py

@@ -1065,6 +1065,14 @@ EVENTS: Dict[int, Dict[str, Union[Alert, AlertCallbackType]]] = {
       Priority.HIGH, VisualAlert.wrongGear, AudibleAlert.promptRepeat, 4.),
   },
 
+  EventName.speedLimitChanged: {
+    ET.PERMANENT: Alert(
+      "Speed Limit Changed",
+      "",
+      AlertStatus.frogpilot, AlertSize.small,
+      Priority.LOW, VisualAlert.none, AudibleAlert.prompt, 3.),
+  },
+
   EventName.torqueNNLoad: {
     ET.PERMANENT: torque_nn_load_alert,
   },