[DISC] make mi scale weighing_mode and unit enum (#1766)

* make mi scale weighing_mode and unit enum

* lint

main/ZmqttDiscovery.ino

@@ -239,7 +239,7 @@ void createDiscovery(const char* sensor_type,
                      int off_delay,
                      const char* payload_available, const char* payload_not_available, bool gateway_entity, const char* cmd_topic,
                      const char* device_name, const char* device_manufacturer, const char* device_model, const char* device_id, bool retainCmd,
-                     const char* state_class, const char* state_off, const char* state_on) {
+                     const char* state_class, const char* state_off, const char* state_on, const char* enum_options) {
   StaticJsonDocument<JSON_MSG_BUFFER> jsonBuffer;
   JsonObject sensor = jsonBuffer.to<JsonObject>();
 
@@ -344,6 +344,10 @@ void createDiscovery(const char* sensor_type,
     sensor["cmd_t"] = command_topic; //command_topic
   }
 
+  if (enum_options != nullptr) {
+    sensor["options"] = enum_options;
+  }
+
   StaticJsonDocument<JSON_MSG_BUFFER> jsonDeviceBuffer;
   JsonObject device = jsonDeviceBuffer.to<JsonObject>();
   JsonArray identifiers = device.createNestedArray("ids");