fix: service class trying to get event loop on init (#61)

The `_new_*_event` methods on the `Service` class were calling the `loop` property instead of using the `_loop` attribute, the property tried to fetch the current thread's event loop which caused some odd issues, this fix delays that until the event loop is actually needed (lazy loading).

mode/services.py

@@ -596,16 +596,16 @@ def __init__(
         super().__init__(loop=self._loop)
 
     def _new_started_event(self) -> Event:
-        return Event(loop=self.loop)
+        return Event(loop=self._loop)
 
     def _new_stopped_event(self) -> Event:
-        return Event(loop=self.loop)
+        return Event(loop=self._loop)
 
     def _new_shutdown_event(self) -> Event:
-        return Event(loop=self.loop)
+        return Event(loop=self._loop)
 
     def _new_crashed_event(self) -> Event:
-        return Event(loop=self.loop)
+        return Event(loop=self._loop)
 
     async def transition_with(
         self, flag: str, fut: Awaitable, *args: Any, **kwargs: Any