[FEAT] Detect and render Bonita connectors

[NathalieC]

Is your feature request related to a problem? Please describe.
Display the connectors with dedicated icon (Nath to add it).
It should be located at the top right hand corner of any task.

[tbouffard]

Bonita connectors are managed via BPMN extension.
Supporting this requires to support BPMN extension and let integrator define it owns renderer to add the connector additional icon.
The rendering part as well as the connector BPMN extension won't be directly managed by bpmn-visualization.

[tbouffard]

We will support BPMN extensions in the future.
This won't be directly implemented in bpmn-visualization, we may provide a specific lib extension.

So closing.