Pedal interceptor longitudinal control

Co-Authored-By: Eric Brown <13560103+nworb-cire@users.noreply.github.com>

cereal/custom.capnp

@@ -20,6 +20,7 @@ struct FrogPilotDeviceState @0xaedffd8f31e7b55d {
 enum FrogPilotEvents @0xf35cc4560bbf6ec2 {
   frogSteerSaturated @0;
   greenLight @1;
+  pedalInterceptorNoBrake @2;
   torqueNNLoad @3;
 }