add plug for aggregate function

[iyuroch]

when doing bulk insert into table with materialised column that has aggregatefunction type it errors since it's unknown type, add plug for that type so we can ignore it when inserting into specific columns

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• Unit and integration tests covering the common scenarios were added
• A human-readable description of the changes was provided to include in CHANGELOG
• For significant changes, documentation in https://github.com/ClickHouse/clickhouse-docs was updated with further explanations or tutorials