[FEAT] Introduce a plugin to expose the bpmn-visualization "overlays API" with names as parameters

[tbouffard]

Rationale

See #73

Proposal

• plugin class: OverlaysByNamePlugin (find a better name)
• plugin id: overlays-by-name
• methods: all overlays related methods from BpmnElementsRegistry

Note: the existing OverlaysPlugin provides a setVisible method that is not related to names or ids. It should be also available in the "name based" plugin (we could introduce a base class for both plugins).

Example of usage

const overlaysPlugin =  bpmnVisualization.getPlugin(‘overlays-by-name’) as OverlaysByNamePlugin;
overlaysPlugin.addOverlays('activity-name-1', {...})