Change default_python template to auto-update version on each wheel build (#1034)

## Changes
Change default_python template to auto-update version on each wheel
build

libs/template/templates/default-python/template/{{.project_name}}/setup.py.tmpl

@@ -10,11 +10,14 @@ from setuptools import setup, find_packages
 import sys
 sys.path.append('./src')
 
+import datetime
 import {{.project_name}}
 
 setup(
     name="{{.project_name}}",
-    version={{.project_name}}.__version__,
+    # We use timestamp as Local version identifier (https://peps.python.org/pep-0440/#local-version-identifiers.)
+    # to ensure that changes to wheel package are picked up when used on all-purpose clusters
+    version={{.project_name}}.__version__ + "+" + datetime.datetime.utcnow().strftime("%Y%m%d.%H%M%S"),
     url="https://databricks.com",
     author="{{user_name}}",
     description="wheel file based on {{.project_name}}/src",