Add support for ApiVersions

[jbruggem]

Supporting this would allow, starting with 0.10.0.0, to not have to individually support versions of the server in the client. KafkaEx could just determine at startup which messages are supported with which version. In the config, choosing kafka_version: "latest" would allow support any version starting with 0.10.0.0.

From the doc :

In order to work against multiple broker versions, clients need to know what versions of various APIs a broker supports. The broker exposes this information since 0.10.0.0 as described in KIP-35. Clients should use the supported API versions information to choose the highest API version supported by both client and broker. If no such version exists, an error should be reported to the user.

See:

• Message spec: https://kafka.apache.org/protocol.html#The_Messages_ApiVersions
• How to handle API versions: https://kafka.apache.org/protocol.html#api_versions
• https://issues.apache.org/jira/browse/KAFKA-3307
• https://cwiki.apache.org/confluence/display/KAFKA/KIP-35+-+Retrieving+protocol+version
• https://archive.apache.org/dist/kafka/0.10.0.0/RELEASE_NOTES.htmll