[WIP] feat: Implement index importer

[highpon]

Description

Related Issue

Versions

• Vald Version: v1.7.15
• Go Version: v1.23.4
• Rust Version: v1.83.0
• Docker Version: v27.4.0
• Kubernetes Version: v1.31.4
• Helm Version: v3.16.3
• NGT Version: v2.3.5
• Faiss Version: v1.9.0

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[highpon]

Move this PR to #2952