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>

cereal/car.capnp

@@ -126,6 +126,7 @@ struct CarEvent @0x9b1657f34caf3ad3 {
     noLaneAvailable @127;
     openpilotCrashed @128;
     pedalInterceptorNoBrake @130;
+    speedLimitChanged @131;
     torqueNNLoad @132;
 
     radarCanErrorDEPRECATED @15;