Allow automatic cleanup merges of entire partitions

Why it matters

This feature addresses the need to automatically merge and clean up partitions in ReplacingMergeTree tables after they reach a specified minimum age. It helps maintain table efficiency and data compactness without manual intervention.

How to use it

Enable automatic cleanup merges by setting enable_replacing_merge_with_cleanup_for_min_age_to_force_merge to 1 (true) and configure the timeout according to your partition age requirements. This setting triggers background merges that clean up partitions once they pass the defined age threshold.