The Neo4j vector store implementation has been enhanced with a builder
pattern to be more intuitive than using ctors and follows spring ai builder
conventions. Current constructors have been deprecated to maintain
backward compatibility for one releaes cycle.
The change includes:
* Move classes to dedicated neo4j package for better organization
* Add comprehensive builder pattern implementation with validation
* Improve documentation with detailed usage examples
* Deprecate but maintain old configuration approach for compatibility
* Update integration tests to demonstrate new builder pattern
* Enhance code readability and maintainability
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