Add SVS leanvec ood support

[ethanglaser]

Adds knowhere wrapper over SVS LeanVec OOD, which is present in FAISS

[sre-ci-robot]

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[sre-ci-robot]

Welcome @ethanglaser! It looks like this is your first PR to zilliztech/knowhere 🎉

[mergify]

@ethanglaser 🔍 Important: PR Classification Needed!

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[ethanglaser]

On hold for benchmarking