Add support for forward translog reading

[xuxiong1]

Description

This commit introduces a feature to read translog operations in forward order
(oldest to newest) instead of the default backward order (newest to oldest).

Changes:

• Add index.translog.read_forward setting (default: false) in IndexSettings
• Update MultiSnapshot to support bidirectional reading based on setting

Tests:

• testRecoveryTrimsLocalTranslogWithReadForward (RecoveryTests)
• testSeqNoCollisionWithReadForward (IndexLevelReplicationTests)
• testSnapshotReadOperationForward (LocalTranslogTests)

Related Issues

Resolves #20094

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[github-actions]

❌ Gradle check result for c968213: null

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?