fix(python): added cleanup_frag_reuse_index#7221
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Closes #7220
Expose the existing Rust frag-reuse pruner to Python as
LanceDataset.cleanup_frag_reuse_index().Deferred-remap compaction appends a generation to the
__lance_frag_reuseindex on every commit, and without pruning these accumulate forever and are loaded on every vector index open. The race-safe pruner from #3836 already exists in Rust but had no Python binding and is never invoked automatically.The binding follows the
migrate_manifest_paths_v2wrapper pattern, the Python method is documented besidecleanup_old_versionsas a periodic maintenance call, and a new test verifies that__lance_frag_reusereports zero versions once all indexes have caught up and the cleanup runs.