ZHA - Event foundation (#19095)

* event foundation

* add missing periods to comments

* reworked so that entities don't fire events

* lint

* review comments

homeassistant/components/zha/entities/entity.py

@@ -103,3 +103,8 @@ class ZhaEntity(entity.Entity):
             'name': self._device_state_attributes['friendly_name'],
             'via_hub': (DOMAIN, self.hass.data[DATA_ZHA][DATA_ZHA_BRIDGE_ID]),
         }
+
+    @callback
+    def zha_send_event(self, cluster, command, args):
+        """Relay entity events to hass."""
+        pass  # don't relay events from entities