Isort preparations (#16555)

* Don't treat typing as an "in-between" module for import order

That was a < 3.5 era thing.

* Tighten scope of some pylint unused-import disables

To avoid isort moving a top level one around, undesirably broadening its
scope.

homeassistant/scripts/check_config.py

@@ -6,10 +6,10 @@ import os
 from collections import OrderedDict, namedtuple
 from glob import glob
 from platform import system
+from typing import Dict, List, Sequence
 from unittest.mock import patch
 
 import attr
-from typing import Dict, List, Sequence
 import voluptuous as vol
 
 from homeassistant import bootstrap, core, loader