feat(Imagen): Add python sdk samples for Multimodal Embeddings

[yil532]

Description

Fixes #

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• generative_ai/multimodal_embedding_image.py:15, tag aiplatform_sdk_multimodal_embedding_image
• generative_ai/multimodal_embedding_image_video_text.py:15, tag aiplatform_sdk_multimodal_embedding_image_video_text
• generative_ai/multimodal_embedding_video.py:15, tag aiplatform_sdk_multimodal_embedding_video

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[yil532]

Weird error, only failed in Python 3.11 and 3.8

[m-strzelczyk]

Weird error, only failed in Python 3.11 and 3.8

It's not really weird, as right now, we're testing only versions 3.8 and 3.11 by default. I'm afraid there's a problems with your code.

You get an error ModuleNotFoundError: No module named 'google.cloud.aiplatform.private_preview' - I guess you need to update the requirements.txt file.

[m-strzelczyk]

If I understand correctly, we're waiting for module publication, so I will turn this PR to draft for now. Please change it back when the module is public.

[yil532]

I just checked, it's still under private preview. I will leave it until the preview/GA launch.

[yil532]

Reassign to Eric to keep track of the status.

[holtskinner]

Ready for review - Only test failures are from other code samples (not edited in this PR)

[gericdong]

Note that the errors in the CI tests are not relevant to this PR.