feat: microgen - adds two init file templates

Author: chalmerlowe

scripts/microgenerator/templates/__init__.py.j2

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+from .client import BigQueryClient
+
+__all__ = ("BigQueryClient",)

scripts/microgenerator/templates/post-processing/init.py.j2

@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -*-
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+from google.cloud.bigquery_v2 import gapic_version as package_version
+
+__version__ = package_version.__version__
+
+{% for import in imports %}
+{{ import }}
+{%- endfor %}
+
+__all__ = (
+{%- for item in all_list %}
+    "{{ item }}",
+{%- endfor %}
+)