[FEAT] Allow to automatically hide and display a Minimap

[NathalieC]

Prerequisites: process-analytics/bpmn-visualization-addons#163, #1488

The default display of a diagram/pool is fit to viewport.
As soon as the user zooms in, the complete view is lost and we can start displaying a minimap to help navigating a complex diagram/pool while keeping a zoom level that makes the details readable.
Close to the zoom controls, save some space to display the minimap when the diagram/pool is zoomed in.
I'm personally not a big fan of needing to press a button to get the minimap, nor about the fact that it is displayed on top of other elements. This is why I'd like it to appear when I zoom in, and have a location saved for it close to the viewport.

[tbouffard]

As for #731 (comment) and #736 (comment), the integration needs to be notified on zoom level change.
Once this is available, the integration will be able to display or hide the minimap.

[tbouffard]

Closing this issue as it is an usage example of #1488