issue: https://github.com/ClickHouse/clickhouse-go/issues/1164 WithAllocBufferColStrProvider allow pre alloc buffer cap for proto.ColStr It is more suitable for scenarios where a lot of data is written in batches.

WithColStrProvider more flexible than WithAllocBufferColStrProvider, such as use sync.Pool.

https://github.com/ClickHouse/ClickHouse/blob/master/src/Columns/ColumnLowCardinality.cpp https://github.com/ClickHouse/clickhouse-cpp/blob/master/clickhouse/columns/lowcardinality.cpp.

https://github.com/ClickHouse/ClickHouse/blob/master/src/Columns/ColumnMap.cpp.

ColStrProvider defines provider of proto.ColStr.