3.1.0

Add audit logging for authorization operations.
There are two types of audit:

• io.aiven.kafka.auth.audit.UserActivityAuditor - aggregate user activity
• io.aiven.kafka.auth.audit.UserOperationsActivityAuditor - aggregate user activity and unique combination of operations
  To use auditor please add two additional properties into Kafka configuration file:
• aiven.acl.authorizer.auditor.aggregation.period - auditor aggregation period in seconds
• aiven.acl.authorizer.auditor.class.name - full qualified auditor class name