out_rdkafka2: Handle some of the exceptions as unrecoverable errors

[cosmo0920]

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This is because msg_size_too_large and topic_authorization_failed error codes should be treated as an unrecoverable error. In Fluentd, we need to mark as unrecoverable with raise Fluent::Unrecoverable. But current implementation does not handle them as unrecoverable errors.

[cosmo0920]

FYI: we use flog to generate arbitrary length of logs. In this case, we use flog -b 1024000 -n 1 to create too huge line to consume by out_rdkafka2 plugin.

[ashie]

Thanks!