[FEAT] Create a demo for all navigation and scrolling features

[tbouffard]

Is your feature request related to a problem? Please describe.

We have several new features that we want to implement, so we will need a demo to demonstrate them

• [FEAT] Provide a Minimap for diagram navigation #163
• [FEAT] Allow to Pan/translate/scroll the BPMN diagram with buttons #164
• [FEAT] Add a plugin to translate/scroll the diagram with keyboard keys #167
• [FEAT] Pan/scroll/translate the BPMN diagram with the mouse wheel #168
• [FEAT] Add a plugin that provides an API to translate/scroll a BPMN element #169

Describe the solution you'd like

Provide a demo with a large diagram that cannot be fully displayed in the BPMN container without doing fit on load. This will make all navigation and scroll features a must have for the demo.
The zoom reset should be a Fit.None to ensure that the diagram is never fully displayed.

The minimap could be displayed with a transparent background as in process-analytics/bpmn-visualization-js#555
The demo should allow to use a BPMN Container with or without scrollbars

Mockup done with https://moqups.com

Additional context

Be aware of #80.

Sharing "zoom controls"

We already have a "zoom controls" button group in the "OverlayPlugin demo".
We could/should avoid duplication and create a component or function to share the code.
We could introduce a JS function that add elements in the DOM

• put title on all buttons
• instead of fit, add an icon and the title should be "Reset zoom level"

[UPDATE] A dedicated component was introduced in #186

Existing zoom bugs

Be aware of this bug about the zoom mouse support with scrollbars: process-analytics/bpmn-visualization-js#1979