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/safe_mode/button/safe_mode_button.cpp

@@ -0,0 +1,25 @@
+#include "safe_mode_button.h"
+#include "esphome/core/hal.h"
+#include "esphome/core/log.h"
+#include "esphome/core/application.h"
+
+namespace esphome {
+namespace safe_mode {
+
+static const char *const TAG = "safe_mode.button";
+
+void SafeModeButton::set_ota(ota::OTAComponent *ota) { this->ota_ = ota; }
+
+void SafeModeButton::press_action() {
+  ESP_LOGI(TAG, "Restarting device in safe mode...");
+  this->ota_->set_safe_mode_pending(true);
+
+  // Let MQTT settle a bit
+  delay(100);  // NOLINT
+  App.safe_reboot();
+}
+
+void SafeModeButton::dump_config() { LOG_BUTTON("", "Safe Mode Button", this); }
+
+}  // namespace safe_mode
+}  // namespace esphome