Nextion upload and sensors (#1464)

Co-authored-by: Senex Crenshaw <senexcrenshaw@gmail.com>

esphome/components/nextion/automation.h

@@ -0,0 +1,30 @@
+#pragma once
+#include "esphome/core/automation.h"
+#include "nextion.h"
+
+namespace esphome {
+namespace nextion {
+
+class SetupTrigger : public Trigger<> {
+ public:
+  explicit SetupTrigger(Nextion *nextion) {
+    nextion->add_setup_state_callback([this]() { this->trigger(); });
+  }
+};
+
+class SleepTrigger : public Trigger<> {
+ public:
+  explicit SleepTrigger(Nextion *nextion) {
+    nextion->add_sleep_state_callback([this]() { this->trigger(); });
+  }
+};
+
+class WakeTrigger : public Trigger<> {
+ public:
+  explicit WakeTrigger(Nextion *nextion) {
+    nextion->add_wake_state_callback([this]() { this->trigger(); });
+  }
+};
+
+}  // namespace nextion
+}  // namespace esphome