Document recompress_unordered columnstore policy option (2.29.0) - #418

Describe your changes

Documents the new recompress_unordered columnstore policy option as a config key on alter_job(). Set it to false so the columnstore policy skips fully compressed chunks whose batches are out of order, leaving that work to the cheaper compaction policy instead of rewriting the whole chunk. Defaults to true, which is the existing behavior.

Dev PR: timescale/timescaledb#10226

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