Jamie

KAFKA-15878: KIP-768 - Extend support for opaque (i.e. non-JWT) tokens in SASL/OAUTHBEARER

3

# Overview * This change pertains to [SASL/OAUTHBEARER ](https://kafka.apache.org/documentation/#security_sasl_oauthbearer) mechanism of Kafka authentication. * Kafka clients can use [SASL/OAUTHBEARER ](https://kafka.apache.org/documentation/#security_sasl_oauthbearer) mechanism by overriding the [custom call back handlers](https://kafka.apache.org/documentation/#security_sasl_oauthbearer_prod) . *...