Add external collection API support

[yhmo]

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[Copilot]

Pull request overview

This PR adds client-side SDK support for Milvus “external collection” operations (refresh + job progress/listing) and extends collection schema handling to carry external source/spec and field mapping information.

Changes:

• Added UtilityService + MilvusClientV2 APIs for refreshing an external collection and querying refresh job progress/history.
• Extended collection schema conversion/creation to include externalSource, externalSpec, and per-field externalField mapping.
• Added unit tests and BaseTest gRPC stubs for the new utility APIs; added JSON helpers in JsonUtils.

Reviewed changes

Copilot reviewed 16 out of 16 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 unit tests for refresh external collection APIs (refresh/progress/list jobs).
sdk-core/src/test/java/io/milvus/v2/BaseTest.java	Mocks new gRPC endpoints for external collection refresh APIs.
sdk-core/src/main/java/io/milvus/v2/utils/SchemaUtils.java	Adds schema conversions for externalSpec/externalSource and externalField.
sdk-core/src/main/java/io/milvus/v2/service/utility/UtilityService.java	Implements new external collection utility methods and job-info conversion.
sdk-core/src/main/java/io/milvus/v2/service/utility/response/RefreshExternalCollectionResp.java	New response model for refresh job ID.
sdk-core/src/main/java/io/milvus/v2/service/utility/response/RefreshExternalCollectionJobInfo.java	New response model for refresh job details.
sdk-core/src/main/java/io/milvus/v2/service/utility/response/ListRefreshExternalCollectionJobsResp.java	New response model for listing refresh jobs.
sdk-core/src/main/java/io/milvus/v2/service/utility/response/GetRefreshExternalCollectionProgressResp.java	New response model for refresh job progress.
sdk-core/src/main/java/io/milvus/v2/service/utility/request/RefreshExternalCollectionReq.java	New request model for starting a refresh.
sdk-core/src/main/java/io/milvus/v2/service/utility/request/ListRefreshExternalCollectionJobsReq.java	New request model for listing refresh jobs.
sdk-core/src/main/java/io/milvus/v2/service/utility/request/GetRefreshExternalCollectionProgressReq.java	New request model for getting refresh progress.
sdk-core/src/main/java/io/milvus/v2/service/collection/request/CreateCollectionReq.java	Extends schema objects with externalSource/externalSpec and field externalField.
sdk-core/src/main/java/io/milvus/v2/service/collection/request/AddFieldReq.java	Adds externalField mapping to AddField request.
sdk-core/src/main/java/io/milvus/v2/service/collection/CollectionService.java	Includes external source/spec in gRPC CollectionSchema when creating collections.
sdk-core/src/main/java/io/milvus/v2/client/MilvusClientV2.java	Exposes new utility APIs on the V2 client.
sdk-core/src/main/java/io/milvus/common/utils/JsonUtils.java	Adds parsing/serialization helpers for JsonObject used by externalSpec.

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