Event entity support (#6451)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/event/event.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <set>
+#include <string>
+
+#include "esphome/core/component.h"
+#include "esphome/core/entity_base.h"
+#include "esphome/core/helpers.h"
+
+namespace esphome {
+namespace event {
+
+#define LOG_EVENT(prefix, type, obj) \
+  if ((obj) != nullptr) { \
+    ESP_LOGCONFIG(TAG, "%s%s '%s'", prefix, LOG_STR_LITERAL(type), (obj)->get_name().c_str()); \
+    if (!(obj)->get_icon().empty()) { \
+      ESP_LOGCONFIG(TAG, "%s  Icon: '%s'", prefix, (obj)->get_icon().c_str()); \
+    } \
+    if (!(obj)->get_device_class().empty()) { \
+      ESP_LOGCONFIG(TAG, "%s  Device Class: '%s'", prefix, (obj)->get_device_class().c_str()); \
+    } \
+  }
+
+class Event : public EntityBase, public EntityBase_DeviceClass {
+ public:
+  void trigger(const std::string &event_type);
+  void set_event_types(const std::set<std::string> &event_types) { this->types_ = event_types; }
+  std::set<std::string> get_event_types() const { return this->types_; }
+  void add_on_event_callback(std::function<void(const std::string &event_type)> &&callback);
+
+ protected:
+  CallbackManager<void(const std::string &event_type)> event_callback_;
+  std::set<std::string> types_;
+};
+
+}  // namespace event
+}  // namespace esphome