Use turn desires when below the minimum lane change speed

Added toggle to use turn desires when below the minimum lane change speed for more precise turns.

cereal/car.capnp

@@ -132,6 +132,8 @@ struct CarEvent @0x9b1657f34caf3ad3 {
     pedalInterceptorNoBrake @131;
     speedLimitChanged @132;
     torqueNNLoad @133;
+    turningLeft @134;
+    turningRight @135;
     vCruise69 @136;
     yourFrogTriedToKillMe @137;
 

cereal/log.capnp

@@ -323,6 +323,12 @@ enum LaneChangeDirection {
   right @2;
 }
 
+enum TurnDirection {
+  none @0;
+  turnLeft @1;
+  turnRight @2;
+}
+
 struct CanData {
   address @0 :UInt32;
   busTime @1 :UInt16;
@@ -945,6 +951,7 @@ struct ModelDataV2 {
     hardBrakePredicted @7 :Bool;
     laneChangeState @8 :LaneChangeState;
     laneChangeDirection @9 :LaneChangeDirection;
+    turnDirection @10 :TurnDirection;
 
 
     # deprecated