Longitudinal Personality (#462)

* adjustable follow

* better name

* better name

* better name

log.capnp

@@ -16,6 +16,12 @@ struct Map(Key, Value) {
     value @1 :Value;
   }
 }
+  
+enum LongitudinalPersonality {
+    aggressive @0;
+    standard @1;
+    relaxed @2;
+  }
 
 struct InitData {
   kernelArgs @0 :List(Text);
@@ -971,6 +977,7 @@ struct LongitudinalPlan @0xe00b5b3eba12876c {
   jerks @34 :List(Float32);
 
   solverExecutionTime @35 :Float32;
+  personality @36 :LongitudinalPersonality;
 
   enum LongitudinalPlanSource {
     cruise @0;