[lake/iceberg] Add rest catalog cache #2622
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Purpose
Query performance for the data lake table is very slow compared to querying remote storage. Add per-task lazy caching of Iceberg Catalog and Table inside IcebergLakeSource so that createRecordReader reuses one loadTable for all lake splits in a Flink source task, eliminating O(splits) REST round-trips when using a REST catalog.
Before: N splits → N × (createCatalog + loadTable) → N REST calls per task.
After: N splits → 1 × (createCatalog + loadTable) on first split, then N-1 reuses → 1 REST loadTable per task. With TTL enabled, the cache is refreshed after the TTL period so externally changed table metadata is picked up.
Linked issue: close #2619
Brief change log
Tests
API and Format
Documentation