Batch message processing doesn't work with Kafka transport

[adamzalesak]

Describe the bug
Batch message handlers are not used when consuming Kafka messages. (No known handler for TestMessage#08dced17-0b69-27bf-54d7-e075bf020000 from kafka://topic/topic_0)

To Reproduce
https://github.com/adamzalesak/WolverineOutboxIssue/blob/main/WolverineOutboxIssue/Program.cs

Expected behavior
When BatchMessagesOf<T> is configured, the batch handler is called for the T message received from Kafka.

[jeremydmiller]

@adamzalesak I'm looking at this now

[jeremydmiller]

Sigh, would have impacted any external transport. @adamzalesak thank you so much for the reproduction. Fix will be in Wolverine 3.0 today. One line code change after all that repro code.