Support highlighter

[yhmo]

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[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: yhmo

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[gemini-code-assist]

Summary of Changes

Hello @yhmo, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request integrates a new "highlighter" feature into the Milvus SDK, enabling users to receive highlighted text fragments within their search results. It introduces a flexible API for configuring both lexical and semantic highlighting, enhancing the search experience by providing more contextually relevant information directly in the response. The changes span across request and response models, as well as internal conversion utilities, to support this new functionality.

Highlights

• Highlighter API Introduction: New Highlighter interface and concrete implementations (LexicalHighlighter, SemanticHighlighter) are added to define highlighting configurations for search requests.
• Search Request Enhancement: The SearchReq class now includes a highlighter field, allowing users to specify highlighting preferences when performing searches.
• Search Response Enrichment: SearchResp.SearchResult is extended with a highlightResults map, and a new HighlightResult class is introduced to encapsulate highlighted fragments and their scores.
• Internal Utility Updates: ConvertUtils and VectorUtils are modified to correctly serialize highlighter configurations for gRPC requests and deserialize highlight results from gRPC responses into the SDK's new data structures.
• Milvus Proto Update: The milvus-proto subproject commit was updated, likely to include the necessary gRPC definitions for the new highlighter feature.

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[gemini-code-assist]

Code Review

This pull request introduces support for the highlighter feature in search requests, a valuable addition for improving search result interpretability. The implementation includes a new Highlighter interface with LexicalHighlighter and SemanticHighlighter implementations, and updates to SearchReq and SearchResp to integrate this feature. The code is well-structured and follows existing design patterns. My review includes suggestions to fix a typo for better maintainability, remove some redundant code, and address a potential integer overflow issue that could affect correctness under certain conditions.