Add support for Tuya Sensors (#1088)

* Add Tuya sensor

* Add tuya sensor to test4

* Forgot id

esphome/components/tuya/sensor/tuya_sensor.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/components/tuya/tuya.h"
+#include "esphome/components/sensor/sensor.h"
+
+namespace esphome {
+namespace tuya {
+
+class TuyaSensor : public sensor::Sensor, public Component {
+ public:
+  void setup() override;
+  void dump_config() override;
+  void set_sensor_id(uint8_t sensor_id) { this->sensor_id_ = sensor_id; }
+
+  void set_tuya_parent(Tuya *parent) { this->parent_ = parent; }
+
+ protected:
+  Tuya *parent_;
+  uint8_t sensor_id_{0};
+};
+
+}  // namespace tuya
+}  // namespace esphome