Add shutdown and safe_mode button (#2918)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
Co-authored-by: Jos Suanet <jos@suanet.net>

esphome/components/shutdown/button/shutdown_button.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include "esphome/core/component.h"
+#include "esphome/components/button/button.h"
+
+namespace esphome {
+namespace shutdown {
+
+class ShutdownButton : public button::Button, public Component {
+ public:
+  void dump_config() override;
+
+ protected:
+  void press_action() override;
+};
+
+}  // namespace shutdown
+}  // namespace esphome