Batch detached node relationship deletes

[adsharma]

Fixes: #168

Summary

Reimplements the detached-delete batching from PR #169 on top of current main.

• batches the relationship-detach phase for DETACH DELETE node execution
• flushes pending batches when the DeleteNode operator exhausts its child and during finalize
• groups multi-label batches by node table before touching relationship tables, preserving filtered match semantics
• logs one generated RelDetachDeleteRecord per source-node batch and replays the ValueVector through detachDeleteBatch

Validation

• ninja -C build/release
• python3 scripts/run-clang-format.py --clang-format-executable /opt/homebrew/bin/clang-format-18 -r
• shell smoke test: 1050-node DETACH DELETE crosses the 1024 batch boundary and removes all attached edges
• shell smoke test: multi-label DETACH DELETE crosses the batch boundary and deletes only the intended table-specific relationship sets
• shell smoke test: persisted reopen after batched DETACH DELETE returns expected node/edge counts, exercising WAL replay of batched detach-delete records