Support to parse nested data type. #6084
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Currently, datatype LowCardinality(String) will be parsed as SQLDataTypleImpl 'LowCardinanlity' with one param SQLIdentifier 'String'. In this PR, we parse 'String' as SQLDataTypeRef instead of Identifier. It only works for pre-defined nestDataType, such us LowCardinality, Nullable, Tuple and etc in clickhouse.