Add the pkgutil style init file to datadog_checks_dev for support on IDEs language server

Author: AAraKKe

datadog_checks_dev/datadog_checks/__init__.py

@@ -0,0 +1,4 @@
+# # (C) Datadog, Inc. 2015-present
+# All rights reserved
+# Licensed under a 3-clause BSD style license (see LICENSE)
+__path__ = __import__('pkgutil').extend_path(__path__, __name__)  # type: ignore