[Draw2D] Implement toString() method for Handle and Layer classes

Author: ptziegler

org.eclipse.wb.core/src-draw2d/org/eclipse/wb/draw2d/Layer.java

@@ -80,4 +80,9 @@ public String getName() {
 	@Override
 	public void setOpaque(boolean opaque) {
 	}
+
+	@Override
+	public String toString() {
+		return "[%s] %s".formatted(getClass().getSimpleName(), getName());
+	}
 }

org.eclipse.wb.core/src-gef/org/eclipse/wb/gef/graphical/handles/Handle.java

@@ -164,4 +164,9 @@ public Point getAccessibleLocation() {
 		translateToAbsolute(p);
 		return p;
 	}
+
+	@Override
+	public String toString() {
+		return "[%s] %s".formatted(getClass().getSimpleName(), getBounds());
+	}
 }