Is your request related to a new offering from AWS?

available on terraform AWS provider self-managed-apache-kafka
.

Is your request related to a problem? Please describe.

Currently, we can't connect self managed kafka.
We need to add self_managed_event_source nested block in your module.

I submit this requested at #200

Describe the solution you'd like.

If self_managed_event_source value is set, we don't need to set event_source_arn.
Only add self_managed_event_source code block.

Describe alternatives you've considered.

code main.tf on aws_lambda_event_source_mapping.this

-   event_source_arn = each.value.event_source_arn 
+   event_source_arn = lookup(each.value, "event_source_arn", null)
...

+  dynamic "self_managed_event_source" {
+    for_each = lookup(each.value, "self_managed_event_source", [])
+    content {
+      endpoints = self_managed_event_source.value["endpoints"]
+    }
+  }

Additional context