enhance: add compaction lifecycle observability APIs

[MrPresent-Han]

issue: #3790

depends on: milvus-io/milvus-proto#668 and milvus-io/milvus#53308

What changed

• add lifecycle-state filtering and lineage metadata to persistent segment listing
• add list_segments with the full retained lifecycle-state default
• add list_serving_segments as the explicit serving-set API
• add collection-scoped list_compaction_tasks while preserving job-scoped plan lookup
• expose complete compaction plan and task metadata through client result types
• support database context in segment and collection task requests
• preserve cleaned task failure reasons in Plan.failure_reason

Retention semantics

Dropped segments and terminal compaction tasks are retained server metadata rather than a permanent audit log, so E2E callers must poll and cache observations within the retention window.

Verification

• 799 related unit tests passed across gRPC handling, request preparation, client types, sync client, and async client
• all 46 gRPC utility tests passed, including cleaned task failure-reason parsing
• local standalone E2E passed after three insert and flush batches: four retained tasks were observable, the active lineage target exactly matched the serving segment set, and all 300 PK and scalar rows were retrieved intact
• this PR remains draft until both protocol and server dependencies are consumable

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[codecov]

Codecov Report

❌ Patch coverage is 98.38710% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 94.23%. Comparing base (a4b3b38) to head (b549a54).

Files with missing lines	Patch %	Lines
pymilvus/client/prepare.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3791      +/-   ##
==========================================
+ Coverage   94.22%   94.23%   +0.01%     
==========================================
  Files          77       77              
  Lines       16204    16250      +46     
==========================================
+ Hits        15268    15313      +45     
- Misses        936      937       +1     

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