cli for elastic

[Denise2004]

Add CLI Support for Elastic Cloud

Summary

Adds command-line interface (CLI) support for Elastic Cloud, enabling users to run VectorDBBench tests via CLI commands for different Elastic Cloud index types.

Changes

• New file: vectordb_bench/backend/clients/elastic_cloud/cli.py
  • Implemented four CLI commands:
    ElasticCloudHNSW - Standard HNSW index
    ElasticCloudHNSWInt8 - HNSW with Int8 quantization
    ElasticCloudHNSWInt4 - HNSW with Int4 quantization
    ElasticCloudHNSWBBQ - HNSW with BBQ quantization
• Modified: vectordb_bench/cli/vectordbbench.py
  • Imported and registered the four Elastic Cloud CLI commands. Commands are now available in the main CLI interface

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: alwayslove2013, Denise2004
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