fix: added missing fields in kafka datasource

[jackdelahunt]

Description

This pro adds fields that were missing from the kafka data source. This was causing crashes before.

Verify

Terraform config (main.tf)

terraform {
  required_providers {
    rhoas = {
      source  = "registry.terraform.io/redhat-developer/rhoas"
      version = "0.1.0"
    }
  }
}

provider "rhoas" {
    offline_token = "..."
}


resource "rhoas_kafka" "instance" {
  name = "instance"
  plan = "developer.x1"
  billing_model = "standard"
}

data "rhoas_kafka" "instance_data" {
  id = rhoas_kafka.instance.id
}

Commands

• make clean
• make install
• terraform init
• terraform apply

Expected Results

All actions should be performed correctly with the new kafka being created and the data source reading the kafka resource.