Add kafkaMurmurHash Function for Kafka DefaultPartitioner Compatibility

Why it matters

This function enables users to compute hashes in ClickHouse that are consistent with Kafka’s DefaultPartitioner. This alignment helps when integrating ClickHouse with Kafka, ensuring partitioning behavior matches between systems and making data ingestion and processing more reliable and predictable.

How to use it

Use the kafkaMurmurHash function directly in your queries to compute hashes consistent with Kafka DefaultPartitioner. For example, apply it within a SELECT statement on the key columns you want to hash.