Add LowCardinality Support in Avro Format

Why it matters

This feature addresses the lack of LowCardinality support when reading from or writing to the Avro data format in ClickHouse. It enables efficient storage and processing of categorical data with low cardinality when using Avro, improving compatibility and performance.

How to use it

To use this feature, users can now insert and select data with LowCardinality columns in tables that use the Avro format without any special configuration. The support is integrated transparently when specifying Avro as the input or output format.