style: reorder imports to follow PEP 8 guidelines

Author: taimo3810

gapic/ads-templates/%namespace/%name/%version/%sub/services/%service/transports/rest.py.j2

@@ -33,12 +33,13 @@ from google.iam.v1 import policy_pb2  # type: ignore
 from google.cloud.location import locations_pb2 # type: ignore
 {% endif %}
 
-from requests import __version__ as requests_version
-from urllib.parse import urlencode
 import dataclasses
 from typing import Any, Callable, Dict, List, Optional, Sequence, Tuple, Union
+from urllib.parse import urlencode
 import warnings
 
+from requests import __version__ as requests_version
+
 {{ shared_macros.operations_mixin_imports(api, service, opts) }}
 
 from .rest_base import _Base{{ service.name }}RestTransport

gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/rest.py.j2

@@ -27,12 +27,13 @@ from google.iam.v1 import policy_pb2  # type: ignore
 from google.cloud.location import locations_pb2 # type: ignore
 {% endif %}
 
-from requests import __version__ as requests_version
-from urllib.parse import urlencode
 import dataclasses
 from typing import Any, Callable, Dict, List, Optional, Sequence, Tuple, Union
+from urllib.parse import urlencode
 import warnings
 
+from requests import __version__ as requests_version
+
 {{ shared_macros.operations_mixin_imports(api, service, opts) }}
 
 from .rest_base import _Base{{ service.name }}RestTransport

gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/rest_asyncio.py.j2

@@ -48,8 +48,8 @@ from google.iam.v1 import policy_pb2  # type: ignore
 from google.cloud.location import locations_pb2 # type: ignore
 {% endif %}
 
-import json  # type: ignore
 import dataclasses
+import json  # type: ignore
 from typing import Any, Dict, List, Callable, Tuple, Optional, Sequence, Union
 from urllib.parse import urlencode
 

gapic/templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2

@@ -21,8 +21,9 @@ import grpc
 from grpc.experimental import aio
 {% if "rest" in opts.transport %}
 from collections.abc import Iterable, AsyncIterable
-from google.protobuf import json_format
 import urllib.parse
+
+from google.protobuf import json_format
 {% endif %}
 import json
 import math