Introduces a builder pattern for configuring WeaviateVectorStore instances and
moves the implementation to the org.springframework.ai.vectorstore.weaviate
package. This change:
- Makes configuration more flexible and type-safe through builder methods
- Improves code organization by moving to a dedicated vector store package
- Deprecates old constructors in favor of the builder pattern
- Adds builder tests
- Enables better IDE support through method chaining
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