Add flexibility for lexical graph config to SimpleKGPipeline

[willtai]

Description

This PR allows users to optionally specify the lexical graph configuration and pass it to SimpleKGPipeline. This allows more flexiblity in specifying the lexical graph configuration used in the LLMEntityRelationExtractor.

This PR tackles the GitHub issue: https://github.com/neo4j/neo4j-graphrag-python/issues/197

Type of Change

• [x] New feature
• [ ] Bug fix
• [ ] Breaking change
• [ ] Documentation update
• [ ] Project configuration change

Complexity

Complexity: Low

How Has This Been Tested?

• [x] Unit tests
• [x] E2E tests
• [x] Manual tests

Checklist

The following requirements should have been met (depending on the changes in the branch):

• [x] Documentation has been updated
• [x] Unit tests have been updated
• [ ] E2E tests have been updated
• [ ] Examples have been updated
• [ ] New files have copyright header
• [x] CLA (https://neo4j.com/developer/cla/) has been signed
• [x] CHANGELOG.md updated if appropriate

[willtai]

@CodiumAI-Agent /update_changelog

[CodiumAI-Agent]

Changelog updates: 🔄

2024-10-31

Added

• Introduced optional lexical graph configuration for SimpleKGPipeline, enhancing flexibility in customizing node labels and relationship types in the lexical graph.

to commit the new content to the CHANGELOG.md file, please type: '/update_changelog --pr_update_changelog.push_changelog_changes=true'

[CodiumAI-Agent]

Changelog updates: 🔄

Next

Added

• Introduced optional lexical graph configuration for SimpleKGPipeline, enhancing flexibility in customizing node labels and relationship types in the lexical graph.

to commit the new content to the CHANGELOG.md file, please type: '/update_changelog --pr_update_changelog.push_changelog_changes=true'