[DMN Designer] Automatic Layout Feature - toolbar integration

This requirement follows up BAPL-1087.

The automatic layout feature should be available from designer toolbar, furthermore we should allow user to undo/redo the automatic layout positioning.

Acceptance criteria

• Add a toolbar button to perform the automatic layout operation
  • Button visible in toolbar
  • Disabled in read only mode, enabled otherwise
• Allow to undo/redo the button's action but one corner case
  • implies using the commands API instead of applying the changes directly on the graph instance
• Show the notification to the user as in BAPL-1087