21460 cursor bti - #5154
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Give cursor compaction a BTI CursorIndexWriter that builds the trie index from cursor-emitted partition and row boundaries. Formats now declare their own cursor support and build their own index writer, replacing the scattered format checks and instanceof dispatch. Copy the partition key once per partition into a reusable key on the write path. Add BTI differential and allocation tests that pin BTI output against the iterator path. patch by Jon Haddad; reviewed by _ for CASSANDRA-21460 Assisted-by: Claude
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Adds BTI support to cursor compaction.