Add async_safe annotation (#3688)

* Add async_safe annotation

* More async_run_job

* coroutine -> async_save

* Lint

* Rename async_safe -> callback

* Add tests to core for different job types

* Add one more test with different type of callbacks

* Fix typing signature for callback methods

* Fix callback service executed method

* Fix method signatures for callback

homeassistant/components/automation/event.py

@@ -4,11 +4,11 @@ Offer event listening automation rules.
 For more details about this automation rule, please refer to the documentation
 at https://home-assistant.io/components/automation/#event-trigger
 """
-import asyncio
 import logging
 
 import voluptuous as vol
 
+from homeassistant.core import callback
 from homeassistant.const import CONF_PLATFORM
 from homeassistant.helpers import config_validation as cv
 
@@ -29,12 +29,12 @@ def async_trigger(hass, config, action):
     event_type = config.get(CONF_EVENT_TYPE)
     event_data = config.get(CONF_EVENT_DATA)
 
-    @asyncio.coroutine
+    @callback
     def handle_event(event):
         """Listen for events and calls the action when data matches."""
         if not event_data or all(val == event.data.get(key) for key, val
                                  in event_data.items()):
-            hass.async_add_job(action, {
+            hass.async_run_job(action, {
                 'trigger': {
                     'platform': 'event',
                     'event': event,