add image command stub

Author: aaronsteers

airbyte_cdk/cli/airbyte_cdk/_image.py

@@ -0,0 +1,15 @@
+# Copyright (c) 2025 Airbyte, Inc., all rights reserved.
+"""Docker image commands."""
+
+import click
+
+
+@click.group(name="image")
+def image_cli_group() -> None:
+    """Docker image commands."""
+    pass
+
+
+__all__ = [
+    "image_cli_group",
+]