branch-4.0: [refactor](paimon) Per-catalog Paimon metadata cache with two-level table+snapshot structure #60478#60741
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- Cherry-picked from [refactor](paimon) Per-catalog Paimon metadata cache with two-level table+snapshot structure #60478
- Keep branch-4.0 compatibility in PaimonExternalCatalog without introducing [feature](paimon) implement create/drop db, create/drop table for paimon #58894
…able+snapshot structure (apache#60478) Refactor Paimon metadata cache from a single global instance to per-catalog instances, introduce a two-level Table+Snapshot cache structure, and unify TTL resolution logic across Iceberg/Paimon/Schema caches. The previous design shared a single `PaimonMetadataCache` instance and a single global `snapshotCache` across all Paimon catalogs. This caused: - Different catalogs could not independently configure cache TTL. - Cache keys had to carry `catalogId` for isolation; invalidation required scanning all keys and filtering. - `PaimonExternalTable` eagerly fetched the `Table` object at construction time, incurring remote calls even when the table was never subsequently accessed. (cherry picked from commit 2c85148)
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