liveDelay message (#34976)

Bring back the lag message

cereal/log.capnp

@@ -2278,6 +2278,21 @@ struct LiveTorqueParametersData {
   useParams @12 :Bool;
 }
 
+struct LiveDelayData {
+  lateralDelay @0 :Float32;
+  validBlocks @1 :Int32;
+  status @2 :Status;
+
+  lateralDelayEstimate @3 :Float32;
+  points @4 :List(Float32);
+
+  enum Status {
+    unestimated @0;
+    estimated @1;
+    invalid @2;
+  }
+}
+
 struct LiveMapDataDEPRECATED {
   speedLimitValid @0 :Bool;
   speedLimit @1 :Float32;
@@ -2508,6 +2523,7 @@ struct Event {
     gnssMeasurements @91 :GnssMeasurements;
     liveParameters @61 :LiveParametersData;
     liveTorqueParameters @94 :LiveTorqueParametersData;
+    liveDelay @146 : LiveDelayData;
     cameraOdometry @63 :CameraOdometry;
     thumbnail @66: Thumbnail;
     onroadEvents @134: List(OnroadEvent);