Add file resource interfaces

[yhmo]

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[Copilot]

Pull request overview

This PR adds Milvus “file resource” support to the Java v2 SDK utility layer by introducing request/response DTOs, wiring new RPC calls through UtilityService and MilvusClientV2, and extending the existing unit-test stubs and tests to cover the new APIs.

Changes:

• Add new utility request/response models for file resources (AddFileResourceReq, RemoveFileResourceReq, ListFileResourcesReq, ListFileResourcesResp, FileResourceInfo).
• Implement addFileResource, removeFileResource, and listFileResources in UtilityService and expose them in MilvusClientV2.
• Extend mock stubbing in BaseTest and add corresponding tests in UtilityTest.

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/UtilityTest.java	Adds tests for add/remove/list file resource APIs.
sdk-core/src/test/java/io/milvus/v2/BaseTest.java	Adds Mockito stubs for the new file resource RPCs.
sdk-core/src/main/java/io/milvus/v2/service/utility/response/ListFileResourcesResp.java	New response wrapper for listing file resources.
sdk-core/src/main/java/io/milvus/v2/service/utility/response/FileResourceInfo.java	New SDK-side model for file resource info.
sdk-core/src/main/java/io/milvus/v2/service/utility/request/RemoveFileResourceReq.java	New request model for removing a file resource.
sdk-core/src/main/java/io/milvus/v2/service/utility/request/ListFileResourcesReq.java	New request model for listing file resources.
sdk-core/src/main/java/io/milvus/v2/service/utility/request/AddFileResourceReq.java	New request model for adding a file resource.
sdk-core/src/main/java/io/milvus/v2/service/utility/UtilityService.java	Adds RPC implementations for add/remove/list file resources.
sdk-core/src/main/java/io/milvus/v2/client/MilvusClientV2.java	Exposes new file resource APIs on the public client.

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