Type check homeassistant.scripts (#25464)

* Run mypy on homeassistant.scripts, disabling bunch of checks for now

* Declare async_initialize in AuthProvider

* Add some type hints

* Remove unreachable code

* Help mypy out

* Script docstring fixes

homeassistant/scripts/benchmark/__init__.py

@@ -5,17 +5,22 @@ from contextlib import suppress
 from datetime import datetime
 import logging
 from timeit import default_timer as timer
+from typing import Callable, Dict
 
 from homeassistant import core
 from homeassistant.const import (
     ATTR_NOW, EVENT_STATE_CHANGED, EVENT_TIME_CHANGED)
 from homeassistant.util import dt as dt_util
 
-BENCHMARKS = {}
+
+# mypy: allow-untyped-calls, allow-untyped-defs, no-check-untyped-defs
+# mypy: no-warn-return-any
+
+BENCHMARKS = {}  # type: Dict[str, Callable]
 
 
 def run(args):
-    """Handle ensure configuration commandline script."""
+    """Handle benchmark commandline script."""
     # Disable logging
     logging.getLogger('homeassistant.core').setLevel(logging.CRITICAL)
 
@@ -40,8 +45,6 @@ def run(args):
             loop.run_until_complete(hass.async_stop())
             loop.close()
 
-    return 0
-
 
 def benchmark(func):
     """Decorate to mark a benchmark."""