SWF-Editor: Enable auto-layout capabilities on load / refresh

[handreyrc]

Summary

The goal of this task is to add auto-layout capabilities to the diagram.
The auto-layout must be automatically applied on every "setContent" (load / refresh) of the workflow.
Note: ELKjs is being used by DMN so consider using the same auto-layout engine.

Description

• Setup auto-layout engine to react flow rendering mechanism
• Apply auto-layout on setContent
• The workflow layout must be top-down with orthogonal lines
• Apply calculated node positions to all nodes
• Apply calculated vertexes (CPs) for each edge to avoid lines crossing and overlaping (ELKjs provides vertexes coordinates)
• Update the static model so it is possible to render a workflow good enough to verify the auto-layout results

Testing

• By running the component it should be possible to verify that the layout of the nodes is top-down with ortogonal lines connecting them
• It should be no overlaps or line cossings