Add system tables for Iceberg materialized view #25110
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Description
Add support for Iceberg metadata system tables like
$fileand$snapshotsfor materialized views.Resolves #10916.
Additional context and related issues
Supports the same metadata tables as regular Iceberg tables; full list of metadata tables is https://trino.io/docs/current/connector/iceberg.html#metadata-tables.
For testing, I extended
BaseIcebergSystemTables(some tests don't apply and are disabled), so the coverage is the same as for metadata tables of regular Iceberg tables.Release notes
( ) This is not user-visible or is docs only, and no release notes are required.
( ) Release notes are required. Please propose a release note for me.
(x) Release notes are required, with the following suggested text: