Add valve component (#6447)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/mqtt/mqtt_valve.h

@@ -0,0 +1,41 @@
+#pragma once
+
+#include "esphome/core/defines.h"
+#include "mqtt_component.h"
+
+#ifdef USE_MQTT
+#ifdef USE_VALVE
+
+#include "esphome/components/valve/valve.h"
+
+namespace esphome {
+namespace mqtt {
+
+class MQTTValveComponent : public mqtt::MQTTComponent {
+ public:
+  explicit MQTTValveComponent(valve::Valve *valve);
+
+  void setup() override;
+  void send_discovery(JsonObject root, mqtt::SendDiscoveryConfig &config) override;
+
+  MQTT_COMPONENT_CUSTOM_TOPIC(position, command)
+  MQTT_COMPONENT_CUSTOM_TOPIC(position, state)
+
+  bool send_initial_state() override;
+
+  bool publish_state();
+
+  void dump_config() override;
+
+ protected:
+  std::string component_type() const override;
+  const EntityBase *get_entity() const override;
+
+  valve::Valve *valve_;
+};
+
+}  // namespace mqtt
+}  // namespace esphome
+
+#endif
+#endif  // USE_MQTT