feat(oss-opensearch): Add version compatibility for 2.x and 3.x

[Akhil-Pathivada]

Summary

This PR adds version compatibility to the OpenSearch client, allowing it to work correctly with both OpenSearch 2.x and 3.x clusters. It resolves a critical issue where 3.x-specific index settings were being sent to 2.x clusters, causing index creation to fail.

Changes

• Added robust version detection using the .info() API and the packaging library for accurate semantic version comparisons.
• Implemented an extensible, declarative registry (VERSION_SPECIFIC_SETTING_RULES) to apply only compatible settings based on the detected cluster version.
• Established a "Fail-Fast" error handling strategy that raises an exception if the cluster version cannot be determined, preventing ambiguous states.

Files Modified

• vectordb_bench/backend/clients/oss_opensearch/oss_opensearch.py
• install/requirements_py3.11.txt

Key Features

✅ Backward Compatible: Now works with OpenSearch 2.x clusters.
✅ Future-Proof: The new design makes it trivial to add rules for future OpenSearch versions.
✅ Robust Error Handling: Prevents ambiguous states by failing fast if the cluster version is unknown.

[Akhil-Pathivada]

/assign @alwayslove2013

[Akhil-Pathivada]

@alwayslove2013 Can you help reviewing this?

[sre-ci-robot]

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This pull-request has been approved by: Akhil-Pathivada, alwayslove2013
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