Support Decimals and Date32 in Avro Format

Why it matters

This feature extends ClickHouse's compatibility with the Avro data format by adding support for Decimal and Date32 types. It resolves issues related to importing and exporting datasets that use these types, enhancing data type fidelity and interoperability with systems relying on Avro.

How to use it

Users can now directly read and write Avro files containing Decimal and Date32 columns without additional conversions. Simply use the Avro format when inserting or selecting data, and ClickHouse will handle these types transparently.