feat(index): expose vector index handle readers#7440
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Add LogicalVectorIndex and VectorIndexHandle APIs for reading IVF centroids and PQ codebooks from named vector indices, including validation and error context for unsupported index layouts. Expose the handle-based readers through Python and Java bindings, with typed Java result models and Python stubs. Cover the readers with Python and Java vector-index tests. Change-Id: I89003cbb4038039613099af8b17ab10ad9535e77
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Purpose
Enable incremental vector index creation to reuse existing IVF centroids and PQ codebooks, avoiding repeated IVF and PQ training when extending an existing vector index.
Fix #7319
Summary
Add LogicalVectorIndex and VectorIndexHandle APIs for reading IVF centroids and PQ codebooks from named vector indices, including validation and error context for unsupported index layouts.
Expose the handle-based readers through Python and Java bindings, with typed Java result models and Python stubs.