Add copy integration (#3241)

esphome/components/copy/sensor/copy_sensor.cpp

@@ -0,0 +1,18 @@
+#include "copy_sensor.h"
+#include "esphome/core/log.h"
+
+namespace esphome {
+namespace copy {
+
+static const char *const TAG = "copy.sensor";
+
+void CopySensor::setup() {
+  source_->add_on_state_callback([this](float value) { this->publish_state(value); });
+  if (source_->has_state())
+    this->publish_state(source_->state);
+}
+
+void CopySensor::dump_config() { LOG_SENSOR("", "Copy Sensor", this); }
+
+}  // namespace copy
+}  // namespace esphome