Added support for protobuf

[foram-splunk]

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Unit Test Results

147 tests   147 ✔️  37s ⏱️
  23 suites      0 💤
  23 files        0 ❌

Results for commit 3be19a2.

[hvaghani221]

LGTM!!

[artemrys]

I guess protobuf support was done somewhere else, this PR seems to bring more testing into it?

[foram-splunk]

The connector doesn’t need to add logic to deserialize the event. Connector only needs to provide converter’s classpath to Kafka connect. I have used confluent's Kafka Connect Protobuf Converter to deserialize topic events.

Brief about converters: Converters help to change the format of data from one format into another format. Converters are decoupled from connectors to allow the reuse of converters between connectors naturally. The Converter used at Source and Sink can take input and output to different set of formats.
(https://docs.oracle.com/en/cloud/paas/event-hub-cloud/admin-guide/kafka-connect-converters.html#:~:text=Converters%20help%20to%20change%20the,to%20different%20set%20of%20formats)

Below image is for Kafka source connect. It will be similar for Kafka sink connect as well. So, the event flow would be:
Kafka -> Converter -> Connector -> Destination(Splunk)