feat: add support for huggingface datasets

[typpo]

Load test cases directly from HuggingFace datasets. To use a dataset, specify it in your config using the huggingface://datasets/ prefix. For example:

description: Testing with HuggingFace dataset

prompts:
  - 'Act as {{act}}. {{prompt}}'

providers:
  - id: openai:gpt-4o-mini

tests: huggingface://datasets/fka/awesome-chatgpt-prompts?split=train

This will load all rows from the dataset and use the act and prompt fields as variables in the prompt template.

[github-actions]

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Filename	Before	After	Improvement	Visual comparison
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