Include contextual information in logs

[robobario]

This requires some upstream work in Kroxylicious but it would be nice to get more context into any warning/debug logs like:

1. identifiers for the consumer/producer connection (I guess logging ips and things could be a GDPR issue?)
2. identifiers for the virtual cluster/target cluster

Maybe the KrpcFilterContext could provide these details like context.metadata().virtualClusterName(), or it could be more deeply integrated with slf4j to somehow offer up a logger that automatically includes this context without each Filter having to craft the log messages.