added idle action for climate (#859)

* added idle

* more clear state description

* Also add drying/fan

Putting it in this PR because it will be put in the same aioesphomeapi release anyway.

* Update bang_bang for idle action


Co-authored-by: root <root@mail.danman.eu>
Co-authored-by: Otto Winter <otto@otto-winter.com>

esphome/components/api/api_pb2.cpp

@@ -158,6 +158,12 @@ template<> const char *proto_enum_to_string<enums::ClimateAction>(enums::Climate
       return "CLIMATE_ACTION_COOLING";
     case enums::CLIMATE_ACTION_HEATING:
       return "CLIMATE_ACTION_HEATING";
+    case enums::CLIMATE_ACTION_IDLE:
+      return "CLIMATE_ACTION_IDLE";
+    case enums::CLIMATE_ACTION_DRYING:
+      return "CLIMATE_ACTION_DRYING";
+    case enums::CLIMATE_ACTION_FAN:
+      return "CLIMATE_ACTION_FAN";
     default:
       return "UNKNOWN";
   }