isort: make available to users

This should make it possible to integrate into more tools.

Bug: 1013096
Change-Id: Idd1502996dafc28b1e5b1bf731125bd64c4f5162
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3613833
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>

.isort.cfg

@@ -0,0 +1,31 @@
+# Copyright 2022 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+#
+# Config file for the isort python module.
+# This is used to enforce import sorting standards.
+#
+# https://pycqa.github.io/isort/docs/configuration/options.html
+
+[settings]
+# Be compatible with `black` since it also matches what we want.
+profile = black
+
+line_length = 80
+length_sort = false
+force_single_line = true
+lines_after_imports = 2
+from_first = false
+case_sensitive = false
+force_sort_within_sections = true
+order_by_type = false
+
+# Ignore generated files.
+extend_skip_glob = *_pb2.py
+
+# Allow importing multiple classes on a single line from these modules.
+# https://google.github.io/styleguide/pyguide#s2.2-imports
+single_line_exclusions =
+    abc,
+    collections.abc,
+    typing,