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/macos/__init__.py

@@ -3,6 +3,8 @@ import os
 import time
 
 
+# mypy: allow-untyped-calls, allow-untyped-defs
+
 def install_osx():
     """Set up to run via launchd on OS X."""
     with os.popen('which hass') as inp: