Add S3vector Engine for AWS OpenSearch, fixed some bugs of AWS OpenSearch cli parameters

[norrishuang]

Summary

1. Add S3vector engine for AWS OpenSearch.
2. Fixed a bug where the --number-of-indexing-clients parameter was missing.
3. Fixed some bugs of aws opensearch cli parameters.

[alwayslove2013]

@norrishuang plz fix the lint issues~

pip install black ruff --upgrade
make format
make lint

[norrishuang]

lint issues

Hi, the lint issues did not related this commit. I think it has fixed now. It's all passed.

PYTHONPATH=pwd` python3 -m black vectordb_bench
All done! ✨ 🍰 ✨
154 files left unchanged.

PYTHONPATH=pwd python3 -m ruff check vectordb_bench --fix
All checks passed!

PYTHONPATH=pwd python3 -m black vectordb_bench --check
All done! ✨ 🍰 ✨
154 files would be left unchanged.

PYTHONPATH=pwd python3 -m ruff check vectordb_bench
All checks passed!`

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: alwayslove2013, norrishuang
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