Feature request: make onEdgeDrop event provide actual Node and Anchor objects and not just ids

[rinart73]

Currently the onEdgeDrop event only provides the following details:

{
  cursor: { x: number, y: number };
  source: {
    anchor: string;
    node: string;
  }
}

In contrast to this the onConnected event proivides:

{
  sourceNode: Node;
  sourceAnchor: Anchor;
  targetNode: Node;
  targetAnchor: Anchor;
}

Those are not the Components btw, they're some internal data type objects. Can we have onEdgeDrop give those objects too?