feat: adapt graphrag_import_neo4j for CSV input format

[liyun11118]

Description

Add support for CSV format input in graphrag_import_neo4j notebook. This change allows the notebook to process input data in CSV format.

Proposed Changes

• Modified column mapping in document import:
  • Changed from using 'title' to 'text' column in create_final_documents.parquet
• Updated entity import configuration:
  • Changed from using 'name' to 'title' column in create_final_entities.parquet
• Updated documentation to reflect CSV format support and configured the yaml file to use CSV format for input data
• Kept core import logic unchanged

Checklist

• [x] I have tested these changes locally.
• [x] I have reviewed the code changes.

Additional Notes

This change maintains backward compatibility while adding support for CSV format input. The core functionality remains unchanged, only the input column mappings have been modified to accommodate the CSV format.

[liyun11118]

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[liyun11118]

@AlonsoGuevara Please take a look when possible. Thanks!