Use CsharpNamespace when Package is empty in ConfluentProtobufTypeResolver

[nazarii-piontko]

Description

This pull request is a basic implementation of the issue addressed here: #404

How Has This Been Tested?

Unit tests for ConfluentProtobufTypeResolver has been created (ConfluentProtobufTypeNameResolverTests).

Two cases are tested there, one when Package is non-empty and the second when Package is empty but CsharpNamespace is available.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have added tests to cover my changes
• I have made corresponding changes to the documentation

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[joelfoliveira]

Hi @nazarii-piontko,

First, thank you for contributing and helping KafkaFlow evolve as a project.

Although this solution does work we think that one of your suggestions in the issue description is aligned with the existing vision for KafkaFlow evolution.

I'm referring to the third solution described in the issue, registering an IAsyncSchemaRegistryTypeNameResolver which would allow overriding this behavior by the client. Nevertheless, the current implementation should work as a "backup" in case the IAsyncSchemaRegistryTypeNameResolver is not declared.

Could you change this PR for that implementation?

[nazarii-piontko]

Hi @joelfoliveira, thank you for your comment. Sure, I could make my solution more generic. Let me close this PR and go ahead with updates.