Add the new diagram layout data structure

[gcoutable]

Remove:

• Position#UNDEFINED
• Node#position
• Node#size
• Edge#routingPoints
• Edge#sourceAnchorRelativePosition
• Edge#targetAnchorRelativePosition
• Label#position
• Label#size
• Label#alignment
• NodeDescription#childrenLayoutStrategyProvider should be childrenLayoutStrategy (should not be dynamic)
• Node#childrenLayoutStrategy (can be computed from description)

Add:

public record DiagramLayoutData (
  Map<String, NodeLayoutData> nodeLayoutData,
  Map<String, EdgeLayoutData> edgeLayoutData
  Map<String, LabelLayoutData> labelLayoutData
) {}

public record NodeLayoutData (
  Position position,
  Size size,
) {}

public record EdgeLayoutData (
  Ratio sourceAnchorRelativePosition,
  Ratio targetAnchorRelativePosition,
  List<Position> routingPoints
) {}

public record LabelLayoutData (
  Position position,
  Size size,
  Position alignment
) {}

[sbegaudeau]

This does not imply any change on the frontend side since we could introduce things like this:

public class NodeSizeDataFetcher {
  public Size get(DataFetcherEnvironment environment) {
    var diagramData = environment.getLocalContext().get("diagramData");
    var nodeId = ((Node) environment.getSource).getId();
    return diagramData.getLayoutData()nodeLayoutData.get(nodeId).size;
  }
}

As a result, we could probably move Size and Position from sirius-components-diagrams to sirius-components-layout-api and remove all the related code from the various components. This would give us a good opportunity to get rid of Position#UNDEFINED and Size#UNDEFINED