feat: V2 examples, deprecate function DTOs, hybrid search function chains, ListCompactionTasks

[yhmo]

Summary

A single PR consolidating the V2 example/deprecation work together with two pymilvus-parity gaps. All changes are additive; no existing API behavior changes (one pure-virtual addition noted below).

Changes

New V2 examples (examples/src/v2/)

• alias.cpp: CreateAlias, ListAliases, DescribeAlias, AlterAlias, DropAlias
• partition.cpp: CreatePartition, HasPartition, LoadPartitions, GetPartitionStatistics, ReleasePartitions, DropPartition
• index.cpp: CreateIndex, ListIndexes, DescribeIndex, AlterIndexProperties, DropIndexProperties, DropIndex (inserts a small row batch so describeIndex reports real rows)

Updated V2 examples

• general.cpp: delete-by-ids, delete-by-filter, TruncateCollection, RenameCollection (with cleanup for the renamed leftover so it is rerun-safe)
• add_field.cpp: AlterCollectionFieldProperties on a newly added field
• db.cpp: AlterDatabaseProperties / DropDatabaseProperties
• examples/README.md: register the new binaries; fix partition entry to GetPartitionStatistics()

Deprecations

• AddCollectionFunctionRequest / DropCollectionFunctionRequest: marked @deprecated (docs only, no compile warnings), pointing to AddFunctionField / DropFunctionField

New public APIs (pymilvus parity)

• HybridSearchRequest: FunctionChains() / SetFunctionChains / WithFunctionChains / AddFunctionChain; Validate() accepts rerank or function chains (mutually exclusive); the pre-callback serializes chains onto the wire
• ListCompactionTasks (ListCompactionTasksRequest + MilvusClientV2::ListCompactionTasks): lists all retained compaction tasks of a collection via GetCompactionStateWithPlans
• CompactionPlan: full CompactionMergeInfo surface (plan_id, trigger_id, collection_id, partition_id, channel, type, state, failure_reason, targets) plus CompactionType / CompactionTaskState enums; GetCompactionPlansResponse gains CollectionName()
• ValidateFunctionChains() shared by SearchRequest and HybridSearchRequest (now enforces limit/offset op-param checks in both)

Infra

• Bumped pinned milvus-proto to ae7fea6 (adds db_name/collection_name/collection_id to GetCompactionPlansRequest; also adds GetPersistentSegmentInfoRequest.states)
• Switched system-test MinIO image to milvusdb/minio:RELEASE.2024-05-28T17-19-04Z because quay.io/minio/minio:RELEASE.2025-09-07T16-13-09Z returns unauthorized on pull and was failing the coverage CI job

API surface note

MilvusClientV2 gains one new pure virtual method ListCompactionTasks. Callers using Create() are unaffected; any external subclass/mock of MilvusClientV2 must add the override.

Testing

testing-ut and testing-it pass; clang-format/cpplint clean.

Signed-off-by: yhmo yihua.mo@zilliz.com

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Codecov Report

❌ Patch coverage is 92.81437% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.72%. Comparing base (a0592aa) to head (5bb7e80).
⚠️ Report is 167 commits behind head on master.

Files with missing lines	Patch %	Lines
src/impl/MilvusClientV2Impl.cpp	84.61%	8 Missing ⚠️
src/impl/utils/DqlUtils.cpp	88.57%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #610       +/-   ##
===========================================
+ Coverage   53.47%   89.72%   +36.24%     
===========================================
  Files          52      393      +341     
  Lines        4432    16841    +12409     
  Branches        0     1851     +1851     
===========================================
+ Hits         2370    15110    +12740     
+ Misses       2062     1731      -331     

Files with missing lines	Coverage Δ
src/impl/MilvusClientV2Impl.h	100.00% <ø> (ø)
src/impl/request/dql/HybridSearchRequest.cpp	90.65% <100.00%> (ø)
src/impl/request/dql/SearchRequest.cpp	94.73% <100.00%> (ø)
...mpl/request/utility/ListCompactionTasksRequest.cpp	100.00% <100.00%> (ø)
...pl/response/utility/GetCompactionPlansResponse.cpp	100.00% <100.00%> (ø)
src/impl/types/CompactionPlan.cpp	100.00% <100.00%> (ø)
src/include/milvus/MilvusClientV2.h	33.33% <ø> (ø)
.../request/collection/AddCollectionFunctionRequest.h	100.00% <ø> (ø)
...request/collection/DropCollectionFunctionRequest.h	100.00% <ø> (ø)
...c/include/milvus/request/dql/HybridSearchRequest.h	100.00% <ø> (ø)
... and 4 more

... and 396 files with indirect coverage changes

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