Add websock command to query device for triggers (#24044)

* Add websock command to query device for triggers

* Lint

* Refactor

* Add support for domain automations

* Make device automation an automation platform

* lint

* Support device_id in light trigger

* Review comments

* Add tests

* Add tests

* lint

homeassistant/components/automation/device.py

@@ -0,0 +1,18 @@
+"""Offer device oriented automation."""
+import voluptuous as vol
+
+from homeassistant.const import CONF_DOMAIN, CONF_PLATFORM
+from homeassistant.loader import async_get_integration
+
+
+TRIGGER_SCHEMA = vol.Schema({
+    vol.Required(CONF_PLATFORM): 'device',
+    vol.Required(CONF_DOMAIN): str,
+}, extra=vol.ALLOW_EXTRA)
+
+
+async def async_trigger(hass, config, action, automation_info):
+    """Listen for trigger."""
+    integration = await async_get_integration(hass, config[CONF_DOMAIN])
+    platform = integration.get_platform('device_automation')
+    return await platform.async_trigger(hass, config, action, automation_info)