Support to add group nodes into Swimlane Validated

Need to provide support to add the group node to the swimlane. As of now, we don't have support to add the group node to the lane at initial rendering and we don't have support to group the toe lane children. we need to implement the support to add group node to the lane in the below cases

• Support to add the group node with childer at initial rendering.

• Support to group the two children in lane at runtime selects it through interaction.

• Support to add the group node at runtime when we drag and drop it into the lane from the symbol palette

• The added group node should move along with the swimlane when it is dragged.

• When we click on the swimlane child group, first the patent group get selected at the second click the group child get select

• Ensure all the above functionality will work after serialization.