Add __init__.py to official/vision/image_classification.
Add __init__.py to official/vision/image_classification.

PiperOrigin-RevId: 264470356

tombstone/models,tombstone/models,alexgorban/models,tombstone/models,alexgorban/models,alexgorban/models,alexgorban/models,tombstone/models,tombstone/models,tombstone/models,alexgorban/models