Support optimize() interface

[yhmo]

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Pull request overview

Adds a new optimize() interface to the Java SDK v2 utility layer, providing an end-to-end “optimize collection” workflow (wait for indexes → compact with optional target size → wait for compaction/index rebuild → refresh load) plus supporting request/response models, task/progress tracking, and examples/tests.

Changes:

• Introduces OptimizeReq, OptimizeResp, and an asynchronous OptimizeTask with progress/cancellation support.
• Extends compact() to pass an optional targetSize (MB) down to the server compaction request.
• Adds an OptimizeExample and unit tests for targetSize parsing.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
sdk-core/src/test/java/io/milvus/v2/service/utility/OptimizeTaskTest.java	Adds unit tests for OptimizeTask.parseTargetSize() parsing/validation.
sdk-core/src/main/java/io/milvus/v2/service/utility/response/OptimizeResp.java	New response DTO for optimize results and progress history.
sdk-core/src/main/java/io/milvus/v2/service/utility/request/OptimizeReq.java	New request DTO to configure optimize (target size, async, timeout).
sdk-core/src/main/java/io/milvus/v2/service/utility/request/CompactReq.java	Adds targetSize (MB) to compaction request model.
sdk-core/src/main/java/io/milvus/v2/service/utility/UtilityService.java	Wires targetSize into ManualCompactionRequest.
sdk-core/src/main/java/io/milvus/v2/service/utility/OptimizeTask.java	Implements background task execution, cancellation, waiting, and size parsing.
sdk-core/src/main/java/io/milvus/v2/client/MilvusClientV2.java	Adds optimize() API and implements the optimize workflow.
examples/src/main/java/io/milvus/v2/OptimizeExample.java	New runnable example demonstrating optimize usage.
examples/src/main/java/io/milvus/v2/HybridSearchExample.java	Comments out functionScore usage (currently introduces a compile issue).

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