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## Description
<!-- Provide a clear description of the changes in this PR -->
• Added load_golden_context parameter to BaseBenchmarkAdapter's abstract
load_corpus method, establishing a common interface for retrieving
supporting evidence
• Refactored HotpotQAAdapter with a modular design: introduced
_get_metadata_field_name method to handle dataset-specific fields
(making it extensible for child classes), implemented get golden context
functionality.
• Refactored TwoWikiMultihopAdapter to inherit from HotpotQAAdapter,
overriding only the necessary methods while reusing parent's
functionality
• Added golden context support to MusiqueQAAdapter with their
decomposition-based format
## DCO Affirmation
I affirm that all code in every commit of this pull request conforms to
the terms of the Topoteretes Developer Certificate of Origin
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **New Features**
- Introduced an option to include additional context during corpus
loading, enhancing the quality and flexibility of generated QA pairs.
- **Refactor**
- Streamlined and modularized the processing workflow across different
adapters for improved consistency and maintainability.
- Updated metadata extraction to refine the display of contextual
information.
- Shifted focus in the `TwoWikiMultihopAdapter` from corpus loading to
context extraction.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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