Indication that some of the connectors mandatory properties are not yet configured

[tplevko]

Please describe the feature that you want to propose

It would be useful to show in the flow diagram that some of the connectors are not yet configured. The connectors have "mandatory" fields and the nodes could be displaying configuration status decorators, as in attached image.

const NODES: NodeModel[] = [
  {
    id: 'node-0',
    type: 'node',
    label: 'Node 0',
    width: NODE_DIAMETER,
    height: NODE_DIAMETER,
    shape: NodeShape.ellipse,
    status: NodeStatus.danger,
    data: {
      badge: 'B',
      isAlternate: false
    }
  },
  {
    id: 'node-1',
    type: 'node',
    label: 'Node 1',
    width: NODE_DIAMETER,
    height: NODE_DIAMETER,
    shape: NodeShape.hexagon,
    status: NodeStatus.warning,
    data: {
      badge: 'B',
      isAlternate: false
    }
  },
  {
    id: 'node-2',
    type: 'node',
    label: 'Node 2',
    width: NODE_DIAMETER,
    height: NODE_DIAMETER,
    shape: NodeShape.octagon,
    status: NodeStatus.success,
    data: {
      badge: 'A',
      isAlternate: true
    }
  },

above is from the PF example code. The interesting part is the status: NodeStatus.xxx which controls what icon is displayed.