Add MEASUREMENT_ANGLE to SensorStateClass (#12085)

esphome/components/api/api_pb2_dump.cpp

@@ -179,6 +179,8 @@ template<> const char *proto_enum_to_string<enums::SensorStateClass>(enums::Sens
       return "STATE_CLASS_TOTAL_INCREASING";
     case enums::STATE_CLASS_TOTAL:
       return "STATE_CLASS_TOTAL";
+    case enums::STATE_CLASS_MEASUREMENT_ANGLE:
+      return "STATE_CLASS_MEASUREMENT_ANGLE";
     default:
       return "UNKNOWN";
   }