Announcing ksqlDB 0.15

ksqlDB 0.15 introduces expanded support for message keys, allowing structured data types (ARRAY, STRUCT) and various serialization formats (JSON, AVRO, PROTOBUF, DELIMITED, KAFKA, JSON_SR) in keys. It also enables PARTITION BY and GROUP BY clauses with multiple expressions for tables and streams with multiple key or primary key columns. Additionally, the DROP command now automatically terminates persistent queries associated with a stream or table, simplifying the management of ksqlDB resources.