support clean metrics of OrphanFilesCleaner

[chongchongxiao]

Purpose

Linked issue: close #114

Support clean metrics of OrphanFilesCleaner

    listDirectoriesDuration
    listDirectories
    listFileStatusDuration
    listFileStatusTasks
    listUsedFilesDuration
    usedFiles
    scanOrphanFilesDuration
    orphanFiles

Tests

No.

API and Format

No.

Documentation

No.

[Copilot]

Pull request overview

This PR adds metrics support to the OrphanFilesCleaner component to track cleaning operations. It introduces a new Duration utility class to simplify timing measurements and refactors existing timing code in FileStoreScan and FileStoreCommit to use this utility.

Changes:

• Added Duration utility class for measuring operation durations in milliseconds
• Implemented CleanMetrics with 8 metric constants for tracking orphan file cleaning operations
• Added GetMetrics() method to OrphanFilesCleaner interface and implementation to expose metrics

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/paimon/core/utils/duration.h	New utility class for timing operations using high_resolution_clock
src/paimon/core/operation/metrics/clean_metrics.h	Defines metric name constants for clean operations
src/paimon/core/operation/orphan_files_cleaner_impl.h	Adds GetMetrics() method and metrics_ member
src/paimon/core/operation/orphan_files_cleaner_impl.cpp	Implements metrics tracking in Clean(), ListPaimonFileDirs(), and GetUsedFiles()
include/paimon/orphan_files_cleaner.h	Adds GetMetrics() to OrphanFilesCleaner interface
src/paimon/core/operation/file_store_scan.cpp	Refactors to use Duration class instead of manual chrono calls
src/paimon/core/operation/file_store_commit_impl.cpp	Refactors to use Duration class instead of manual chrono calls

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[lucasfang]

+1