Add pkgutil-style for the package (#84)

Since the package is under databricks namespace. pip install this package will cause issue importing other packages under the same namespace like automl and feature store. Adding pkgutil style to resolve the issue.

Signed-off-by: lu-wang-dl <lu.wang@databricks.com>

Author: lu-wang-dl

src/databricks/__init__.py

@@ -0,0 +1,4 @@
+# https://packaging.python.org/guides/packaging-namespace-packages/#pkgutil-style-namespace-packages
+# This file should only contain the following line. Otherwise other sub-packages databricks.* namespace
+# may not be importable.
+__path__ = __import__("pkgutil").extend_path(__path__, __name__)