[vector] Expose IVF search tuning options

[shyjsarah]

Summary

Expose the IVF and IVF-PQ query tuning options added by paimon-vector-index 0.4.0 through Paimon vector search requests.

This lets callers bound the initial filtered IVF probe expansion and control IVF-PQ batch distance-table reuse without changing the existing defaults.

Changes

• propagate ivf.max_initial_filter_expansion_factor to scalar and batch vector searches
• propagate ivf_pq.batch_table_reuse and ivf_pq.batch_table_reuse.max_bytes to batch searches
• parse the reuse memory budget as a long value
• reuse one resolved parameter object for filtered and unfiltered batch native calls
• document the new options, their defaults, scope, and Recall@K trade-off
• add coverage for validation, reuse mode propagation, memory budget propagation, and values larger than 32-bit integers

Compatibility

• no default behavior change
• no storage format change or index rebuild required
• IVF-PQ batch table reuse remains auto with a 512 MiB default budget
• the initial filter expansion cap remains unset by default

Paimon now consumes the released paimon-vector-index 0.4.0 through #9341. This restores and extends the Paimon-side option wiring previously introduced in #8925.

Testing

• mvn -nsu -pl paimon-vector test (44 run, 0 failures, 0 errors, 2 skipped)
• Checkstyle and Spotless checks passed as part of the Maven lifecycle
• git diff --check

[JingsongLi]

+1