Expose `.open_feed()` and `open_piker_runtime()` eps at top level

piker/__init__.py

@@ -18,3 +18,10 @@
 piker: trading gear for hackers.
 
 """
+from ._daemon import open_piker_runtime
+from .data.feed import open_feed
+
+__all__ = [
+    'open_piker_runtime',
+    'open_feed',
+]

piker/_daemon.py

@@ -199,7 +199,7 @@ async def open_piker_runtime(
     # for data daemons when running in production.
     debug_mode: bool = False,
 
-) -> Optional[tractor._portal.Portal]:
+) -> tractor.Actor:
     '''
     Start a piker actor who's runtime will automatically sync with
     existing piker actors on the local link based on configuration.