NIFI-12614: Create record reader service for Protobuf messages

[mark-bathori]

Summary

The implementation does not generate message specific code with builders, instead it reads the schema from the provided proto file and maps it with the Unknown field list parsed from encoded proto data.

NIFI-12614

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• [x] Apache NiFi Jira issue created

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• [x] Pull Request title starts with Apache NiFi Jira issue number, such as NIFI-00000
• [x] Pull Request commit message starts with Apache NiFi Jira issue number, as such NIFI-00000

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  • [x] JDK 21

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• [ ] New dependencies are compatible with the Apache License 2.0 according to the License Policy
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Documentation

• [ ] Documentation formatting appears as expected in rendered files

[dan-s1]

@mark-bathori With a big addition such as this, I would recommend some more documentation for end users so they are clear on how this works and for those who need to review the code. :) This would go in your case under nifi-nar-bundles/nifi-protobuf-bundle/nifi-protobuf-services/src/main/resources/org.apache.nifi.services.protobuf.ProtobufReader/additionalDetails.html

To get ideas on how to format and what to include, take a look at the other readers and the documentation they have.

[mark-bathori]

Thanks @dan-s1 for the comment. I've added additionDeatils page to the Reader in my latest commit.

[dan-s1]

@exceptionfactory Can you please restart the dependency-check? The exception does not seem to relate to the changes. Thanks!

[tpalfy]

LGTM Thank your for work @mark-bathori and for the review @dan-s1 ! Merged into main.