[2/2] notebooks: add OpenAI text embeddings

[mohamedawnallah]

Description

Closes #37344.
Prev #36081.

Website Update Demo

Beam.Open.AI.Text.Embeddings.Integration.mov

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[gemini-code-assist]

Summary of Changes

Hello @mohamedawnallah, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new example notebook that guides users through the process of generating text embeddings using OpenAI's powerful models within the Apache Beam MLTransform framework. It highlights how to leverage models like 'text-embedding-3-small' and 'text-embedding-3-large', demonstrating the flexibility of configuring embedding dimensions to optimize for specific use cases. The accompanying documentation has also been updated to reflect this new capability, providing a comprehensive resource for integrating OpenAI text embeddings into Beam pipelines.

Highlights

• New OpenAI Text Embeddings Notebook: A new example notebook has been added to demonstrate how to generate text embeddings using OpenAI models (e.g., 'text-embedding-3-small', 'text-embedding-3-large') with Apache Beam's MLTransform.
• Configurable Embedding Dimensions: The notebook showcases the ability to configure the dimensions of the generated embeddings, allowing users to balance quality with storage and computation costs.
• MLTransform Read/Write Modes: The example illustrates the use of MLTransform in both 'write' mode (to save transforms) and 'read' mode (to apply saved transforms for consistent preprocessing).
• Documentation Update: The MLTransform documentation on the Apache Beam website has been updated to include OpenAITextEmbeddings as a supported transform, along with a link to the new example notebook.

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[github-actions]

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R: @damccorm for label website.

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[mohamedawnallah]

stop reviewer notifications

EDIT: Not currently ready for review. It will be ready for the unreleased version after the current so the notebook remain functional

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