Create Topic if not exist

[gsferreira]

Summary

Add the option to the framework to Create a Topic if not exist when a Cluster is configured.

Background and Motivation

In scenarios like demos or coding samples, it simplifies the author's life.

Proposed Feature

                kafka => kafka
                    .UseConsoleLog()
                    .AddCluster(
                        cluster => cluster
                            .WithBrokers(new[] { "localhost:9092" })
                            .CreateTopicIfNotExists("my-topic-name", 1, 1)
                            .AddProducer(
                            ...

• Add to the ClusterConfiguration an option CreateTopicIfNotExists(string topicName), int numberOfPartitions, int numberOfReplicas)

Open questions

1. Where's the best place to perform the task? Should we do it on KafkaConfigurationBuilder.Build()?

[filipeesch]

Where's the best place to perform the task? Should we do it on KafkaConfigurationBuilder.Build()?

Yes, I think it can be a good place.

[gsferreira]

Perfect. I can peek up this one and open a PR.