Imagen editing

[paulb777]

Result of partnering with Gemini CLI after asking it to start from the Android implementation

[gemini-code-assist]

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[google-oss-bot]

	2 Warnings
⚠️	Did you forget to add a changelog entry? (Add #no-changelog to the PR description to silence this warning.)
⚠️	New public headers were added, did you remember to add them to the umbrella header?

Generated by 🚫 Danger

[paulb777]

/gemini review

[gemini-code-assist]

Code Review

This pull request introduces image editing capabilities to the Imagen model, including inpainting and outpainting. The changes are extensive, adding new public APIs, internal types, and utility functions for image manipulation. My review focuses on improving API consistency, robustness of image handling, error handling, and test coverage. Key suggestions include making the inpaintImage and outpaintImage APIs more consistent and safer, improving the robustness of image data processing, and enhancing the encoding logic for reference images to be more future-proof. I've also recommended expanding unit tests to cover failure scenarios.