Add Image Watermarking (#11831)
* Initial push of image watermarking
* Update image_utils.py
Minor error wording change.
* Change variable handling for ubuntu-latest-not-flaky test.
* Updating in light of flaky test results
* Specifying types and expected values to address flaky test failure.
* Ran scripts/generate_notebooks.py to reconcile hygiene-test failure.
* Update image_utils.py
Comment change.
* add changeset
* Smaller bird bmp
* Adressing comments; checking what happens.
* Changing following Abubakar comments.
* Removing another image file.
* Delete demo/image_watermark/files/lion.png
* Re-auto-generating demo notebook in light of deleted image file.
* changes
* changes
* docstring
* format
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Co-authored-by: gradio-pr-bot <gradio-pr-bot@users.noreply.github.com>
Co-authored-by: Abubakar Abid <abubakar@huggingface.co>
