Add copy integration (#3241)

esphome/components/copy/switch/copy_switch.h

@@ -0,0 +1,23 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/components/switch/switch.h"
+
+namespace esphome {
+namespace copy {
+
+class CopySwitch : public switch_::Switch, public Component {
+ public:
+  void set_source(switch_::Switch *source) { source_ = source; }
+  void setup() override;
+  void dump_config() override;
+  float get_setup_priority() const override { return setup_priority::DATA; }
+
+ protected:
+  void write_state(bool state) override;
+
+  switch_::Switch *source_;
+};
+
+}  // namespace copy
+}  // namespace esphome