Implement Media Player and I2S Media player (#3487)

esphome/core/controller.cpp

@@ -73,6 +73,12 @@ void Controller::setup_controller(bool include_internal) {
       obj->add_on_state_callback([this, obj]() { this->on_lock_update(obj); });
   }
 #endif
+#ifdef USE_MEDIA_PLAYER
+  for (auto *obj : App.get_media_players()) {
+    if (include_internal || !obj->is_internal())
+      obj->add_on_state_callback([this, obj]() { this->on_media_player_update(obj); });
+  }
+#endif
 }
 
 }  // namespace esphome