AI Search on streaming tables, materialized views and managed Iceberg tables

Adds streaming tables, materialized views and managed tables using Iceberg v3 or above as source tables for AI Search indexes, alongside Delta Lake tables, and keeps the index synced as the source is updated. A materialized view needs external metadata (also called Smart Clone) enabled on the view or on the pipeline that defines it, and on standard endpoints the source must use a change data feed, which tables with row tracking enabled provide automatically.

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