lint: api: sort imports

After configuring sort behavior in isort.cfg, run `./scripts/isort`
on all the api/ modules in the tree.

BUG=b:187788732
TEST=`cros lint` is clean

Change-Id: I838009ea70ff52a1560a597509909c0b514247b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/3615052
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Alex Klein <saklein@chromium.org>
diff --git a/api/router.py b/api/router.py
index a89773b..3a89daf 100644
--- a/api/router.py
+++ b/api/router.py
@@ -38,10 +38,12 @@
 from chromite.lib import osutils
 from chromite.utils import memoize
 
+
 if TYPE_CHECKING:
+  from chromite.third_party import google
+
   from chromite.api import api_config
   from chromite.api import message_util
-  from chromite.third_party import google
 
 MethodData = collections.namedtuple(
     'MethodData', ('service_descriptor', 'module_name', 'method_descriptor'))