Kafka: fix flexible version handling #1060
Merged
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closes #1056
I managed to upstream the logic for converting an api version to a header version.
Refer to tychedelia/kafka-protocol-rs#21 and tychedelia/kafka-protocol-rs#22 for more info.
In order to avoid manually parsing the api_key and api_version we should one day upstream some wrappers to kafka-protocol-rs that does this for us.
For now we can land this PR as it fixes our header version issue.