Support passing properties to Kafka Connect client

[djboris9]

Which version of the app are you running?

Tag: v0.4.0 and master@d9e74deb287e7b81172c6988dd0f99b1a97d9036

Is your proposal related to a problem?

Currently it's not possible to configure a Kafka Connect component that has TLS Client Auth required but there could be also other settings that need to be passed to the Kafka Connect Client.

Describe the solution you'd like

I would like to propose adding a Properties field to the model.KafkaConnectCluster class like the model.KafkaCluster and use the properties in the client instantiation.

Therefore the Kafka Connect component could be configured in the following way to allow TLS Client Auth:

KAFKA_CLUSTERS_0_KAFKACONNECT_0_PROPERTIES_SECURITY_PROTOCOL=SSL
KAFKA_CLUSTERS_0_KAFKACONNECT_0_PROPERTIES_SSL_TRUSTSTORE_LOCATION=ca.jks
KAFKA_CLUSTERS_0_KAFKACONNECT_0_PROPERTIES_SSL_TRUSTSTORE_PASSWORD=xxxx
KAFKA_CLUSTERS_0_KAFKACONNECT_0_PROPERTIES_SSL_KEYSTORE_LOCATION=foobar.jks
KAFKA_CLUSTERS_0_KAFKACONNECT_0_PROPERTIES_SSL_KEYSTORE_PASSWORD=xxxx

Describe alternatives you've considered

N/A

Additional context

This issue is propably related to #930.

If I get some spare time, I will have a look by myself at it and create a PR.

[github-actions]

Hello there djboris9! 👋

Thank you and congratulations 🎉 for opening your very first issue in this project! 💖

In case you want to claim this issue, please comment down below! We will try to get back to you as soon as we can. 👀

[Haarolean]

Hey, thanks for reaching out.

We'll add this to our backlog :)

[djboris9]

Working on this in #2833