Update huggingface model handler info

[derrickaw]

1. Update naming of model handler
2. Add doc string for model handler
3. Add another handler example for runinference
4. Fixes: [yaml] Normalize RunInference transform #28700

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Summary of Changes

Hello, 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 standardizes the naming of the HuggingFace model handler within the Apache Beam YAML ML module. It also improves developer experience by adding detailed documentation and examples, ensuring users have clear guidance on how to configure and utilize the handler for inference tasks.

Highlights

• Renaming: Renamed the HuggingFace model handler to 'HuggingFacePipelineModelHandler' for better consistency.
• Documentation: Added comprehensive docstrings to the model handler to improve usability and provide clear usage examples.
• Example Update: Updated the RunInference YAML test configuration to reflect the new naming convention.

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Code Review

This pull request renames the Hugging Face pipeline model handler from HuggingFacePipeline to HuggingFacePipelineModelHandler across tests, class definitions, and error messages, while also adding comprehensive docstrings. A review comment points out that this renaming is a breaking change for existing YAML pipelines and suggests registering both names using stacked decorators to maintain backward compatibility.

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