Modularize generic table federation #2379
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In apache#2369 Iceberg table federation was refactored around the new `IcebergRESTExternalCatalogFactory` type based on discussion in the community sync. This has unblocked the ability to federate to more non-Iceberg catalogs, such as in apache#2355. This PR refactors generic table federation to go through the same mechanism. After this, we can go through and implement generic table federation for the existing `IcebergRESTExternalCatalogFactory` implementations.
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In #2369 Iceberg table federation was refactored around the new
IcebergRESTExternalCatalogFactorytype based on discussion in the community sync. This has unblocked the ability to federate to more non-Iceberg catalogs, such as in #2355. This PR refactors generic table federation to go through the same mechanism. After this, we can go through and implement generic table federation for the existingIcebergRESTExternalCatalogFactoryimplementations.