MINOR: Add api version to uncaught exception message (#7311)

When we have an unhandled exception in the request handler, we print some details about the request such as the api key and payload. It is also useful to see the version of the request which is not always apparent from the request payload.

Reviewers: Guozhang Wang <wangguoz@gmail.com>

core/src/main/scala/kafka/server/KafkaApis.scala

@@ -2683,6 +2683,7 @@ class KafkaApis(val requestChannel: RequestChannel,
       s"clientId=${request.header.clientId}, " +
       s"correlationId=${request.header.correlationId}, " +
       s"api=${request.header.apiKey}, " +
+      s"version=${request.header.apiVersion}, " +
       s"body=${request.body[AbstractRequest]}", e)
     if (mayThrottle)
       sendErrorResponseMaybeThrottle(request, e)