Conditional Kafka providers

[prm-dan]

This is more of a feature request than a bug. I want to support 1 or 2 kafka providers in the same module using a condition variable. I don't think this is feasible with Terraform. My current plan is to create extra root modules for each condition (so each root module has it's own provider).

Example:

var.has_migration_cluster

When it's true, I want to TF to manage another Kafka cluster.