Add the support for label location (TOP_CENTER only)

[gcoutable]

Location

The inside label can be located on:

• TOP_LEFT
• TOP_CENTER
• TOP_RIGHT
• LEFT_CENTER
• CENTER
• RIGHT_CENTER
• BOTTOM_LEFT
• BOTTOM_CENTER
• BOTTOM_RIGHT

The label needs to contain its location. We need to add the following concepts:

public enum InsideLabelLocation {
  TOP_LEFT,
  TOP_CENTER,
  TOP_RIGHT,
  LEFT_CENTER,
  CENTER,
  RIGHT_CENTER,
  BOTTOM_LEFT,
  BOTTOM_CENTER,
  BOTTOM_RIGHT,
}

public class InsideLabel {
  private InsideLabelLocation location;
}

At this point in time, we will not be able to have outside labels anymore. In the odesign compatibility layer, the inside label will be configured to TOP_CENTER while it will be configurable in the View DSL.

This should be tested with list nodes

[gcoutable]

For the first implementation, we will support only TOP_CENTER labels