[WIP][core] Introduce buckets table #3943
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Purpose
The Level 0 file backlog ratio reflects whether compaction is being performed in a timely manner.
Formula: level0_file_backlog_ratio = level0_file_count / num-sorted-run.compaction-trigger.
Tests
org.apache.paimon.table.system.BucketsTableTest
API and Format
Documentation
System Tables