[Feature][integration][Java] Java Implementation of Vector Store with Milvus Support #661

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Description

Following the design proposal in #143 and infrastructure introduced in #321, we want to add a Milvus-based vector store implementation to enhance RAG capabilities with Milvus in Flink Agents. This issue focuses on implementing the Java Milvus vector store integration.

The implementation should include:

• Add MilvusVectorStore under integrations/vector-stores/milvus
• Reuse the existing BaseVectorStore, Document, VectorStoreQuery, and VectorStoreQueryResult APIs
• Support Milvus connection configuration, such as uri, token, username, password, and database
• Support collection/search configuration, such as collection_name, vector_field, text_field, primary_key_field, output_fields, and search params
• Convert Milvus query results into the common Document type
• Add unit tests and/or integration tests for query argument parsing and result conversion

Are you willing to submit a PR?

• I'm willing to submit a PR!