Improve Workflow configuration

[joshhornby]

Currently when adding a workflow the configuration must be json, we should improve this.

resource "twiliotaskrouter_workflow" "english_agents_workflow" {
    friendly_name = "Example Workflow"
    task_reservation_timeout = "20"
    configuration = <<EOF
{
"task_routing": {
        "default_filter": {
            "queue": "${twiliotaskrouter_queue.english_language_queue.id}"
        },
        "filters": [
            {
                "filter_friendly_name": "Hello World",
                "expression": "type=='sales'",
                "targets": [
                    {
                        "queue": "${twiliotaskrouter_queue.english_language_queue.id}",
                        "priority": "100"
                    },
                    {
                        "queue": "${twiliotaskrouter_queue.english_language_queue.id}",
                        "priority": "10"
                    }
                ]
            }
        ]
    }
}
EOF

  depends_on = ["twiliotaskrouter_queue.english_language_queue", "twiliotaskrouter_queue.english_language_queue"]
}

Something like this is my initial idea, but hoping others will have some ideas.

resource "twiliotaskrouter_workflow_configuration" "workflow_configuration" {
    default_queue: "${twiliotaskrouter_queue.english_language_queue.id}"
    filter {
        friendly_name: "Hello World"
        expression: "type=='sales'"
        targets: [
            {
              queue: "${twiliotaskrouter_queue.english_language_queue.id}"
              priority: "100"
            }
        ]
    }
}

resource "twiliotaskrouter_workflow" "english_agents_workflow" {
    friendly_name = "Example Workflow"
    task_reservation_timeout = "20"
    configuration = "${twiliotaskrouter_workflow_configuration.workflow_configuration.json}"
}