Add support for Tuya Climate devices (#1076)

* Start support for tuya climate devices

* Add tuya climate to test4

* Fix lint and cast

* Remove blank line

* Try to display accurate action based on observed behaviour.

* Fix action when in off mode

* Improve config dump

* merge use of CONF_SWITCH_DATAPOINT

Co-authored-by: Guillermo Ruffino <glm.net@gmail.com>

esphome/components/tuya/climate/tuya_climate.h

@@ -0,0 +1,45 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/components/tuya/tuya.h"
+#include "esphome/components/climate/climate.h"
+
+namespace esphome {
+namespace tuya {
+
+class TuyaClimate : public climate::Climate, public Component {
+ public:
+  void setup() override;
+  void dump_config() override;
+  void set_switch_id(uint8_t switch_id) { this->switch_id_ = switch_id; }
+  void set_target_temperature_id(uint8_t target_temperature_id) {
+    this->target_temperature_id_ = target_temperature_id;
+  }
+  void set_current_temperature_id(uint8_t current_temperature_id) {
+    this->current_temperature_id_ = current_temperature_id;
+  }
+  // void set_eco_mode_id(uint8_t eco_mode_id) { this->eco_mode_id_ = eco_mode_id; }
+
+  void set_tuya_parent(Tuya *parent) { this->parent_ = parent; }
+
+ protected:
+  /// Override control to change settings of the climate device.
+  void control(const climate::ClimateCall &call) override;
+  /// Return the traits of this controller.
+  climate::ClimateTraits traits() override;
+
+  /// Re-compute the state of this climate controller.
+  void compute_state_();
+
+  /// Switch the climate device to the given climate mode.
+  void switch_to_action_(climate::ClimateAction action);
+
+  Tuya *parent_;
+  optional<uint8_t> switch_id_{};
+  optional<uint8_t> target_temperature_id_{};
+  optional<uint8_t> current_temperature_id_{};
+  // optional<uint8_t> eco_mode_id_{};
+};
+
+}  // namespace tuya
+}  // namespace esphome